A variety of love song (or sincere lust song) addressed to a specific part of someone's anatomy — their arse.
Generally, this will also involve the singer exhorting the buttocks possessor and the listeners to shake that plump bi-domed anatomical feature, shake it good.
Contrast with Intercourse with You, where the song moves on from specific features to associated activities.
Ross from Friends once got his infant daughter Emma to stop crying by singing "Baby Got Back" to her. Rachel was distinctly unamused, though she ended up resorting to the same song later in the episode.
In an early episode of Mock the Week, John Oliver sang the first few lines of "Baby Got Back" as an example of one of the voices in Tony Blair's head.
"Dance: Ten; Looks: Three" from A Chorus Line (often called "Tits and Ass") is all about how much the dancer likes her surgically-enhanced breasts and butt, and how much more attractive they make her.
Seanbaby made a list of "The Ten Bootiest Songs of All Time" for Cracked, scoring them by dividing the length of the song by the number of butt references. ("Baby Got Back" didn't even make the list.)
Futurama - The Trope Namer, from the episode "A Fishful of Dollars". Fry listens to "Baby Got Back", which Bender later refers as "stuffy old songs about the buttocks".
A Home Movies episode featured a troupe of college-age kids doing a stage workshop on tolerance - a girl sings a song about understanding with lyrics "And you can throw rocks from your house of glass/It ain't no skin off of my ass" - and the song veers off into her referencing her ass over and over.
Titan Maximum - Sasha's single, "Booty Crack", features lyrics consisting mostly of (and including) "many synonyms for 'buttocks'".
Archer's ringtone, "Mulatto Butts", which is also shared by a random one-shot character.
"Waggle Dance" from Phineas and Ferb is possibly as kid-friendly as you can get with this.
And then Jonathan Coulton did a cover of it which turned it from an aggressive hip hop song into a gentle folk rhythm that is also a love ode to the callipygian figure.
Wreckx-n-Effect - "Rump Shaker"
Inverted with "What What (in the Butt)" by Samwell. It's about the male butt...
Also inverted with Mozart's "Leck mich im Arsch" (Lick Me In the Ass). Of course, given the vagaries of German, "Kiss My Ass" is at least as good of a translation.
"Professor, what's another word for pirate treasure?" "Well I think it's booty! B-booty! B-b-b-b-booty! Yep, that's what it is!" - "Professor Booty"
R. Kelly - "Feelin' On Your Booty"
There is a song which pretends (poorly) to be about coping with rationing in wartime named "Please Leave My Butter Alone", in which the singer laments the fact that everyone keeps pinching her butter.
P. Diddy, Murphy Lee and Nelly - "Shake Your Tailfeather"
Trace Adkins - "Honky Tonk Badonkadonk"
Tyler Dean - "Built for Blue Jeans"
Ludacris - "Money Maker"
Justin Moore's "Back That Thing Up" is a subversion. At first, it sounds like a clone of "Badonkadonk", until he gets to the line "Ain't no time to play today, no rollin' in the hay", which makes it clear that the song really is about her "backing up" the truck.
Lene Nystrom's "It's Your Duty (To Shake That Booty)"
In Brazil, axé music was labeled "Bunda Music" ("Butt Music") due to having many songs about this... and the simple fact that many bands were successful because of their sexy dancers.
"Back That Ass Up" by Juvenile.
E-40's "U And Dat."
A hurricane of Double Entendres in Benny Bell's "Everybody Wants My Fanny".
Destiny's Child made "Bootylicious" a legitimate word in the dictionary.
When Willie Dixon first wrote "Back Door Man" for Howlin' Wolf, the sneaky metaphor was simple enough. By the time The Doors got a crack at the song, the title phrase had acquired additional heft. Don't ask about the lines regarding gustatory preferences.
Before Eddie Murphy was among those actors (Bruce Willis, John Belushi and William Shatner, etc.) who attempted to demonstrate legit singing talent for the pop charts — he probably hopes we've forgotten about that — his first comedy album included the deliberately goofy "Boogie in Your Butt". The lyrics read like a list of emergency-room horror stories.
Sisqo's Thong Song, which also has a brief Foot Focus towards the end.
"Whoot There It Is" by 95 South (which, incidentally, is older than the more famous Tag Team hit "Whoomp There It Is").
Anything the mid-90s dance rap group The Outhere Brothers have ever done. Most notably "Don't Stop (Wiggle Wiggle)", "Boom Boom Boom", and especially "I Wanna Fuck You In The Ass".
I wanna kiss her butt... she won't let me. I wanna whisper sweet nothin's in her (r)ear. I wanna hold her behind... closed doors and more. I wanna kiss her butt... she won't let me.
Bride of Frankenstein star and diseuseElsa Lanchester astonishingly had three of these: "I'm Glad To See Your Back", "My New York Slip", and "Linda And Her Londonderry Air".
