Subverted: Bob is short, wears glasses, and has a black belt in karate. But as soon as he opens his mouth, it turns out he's not actually very smart.
Double Subverted: Actually, he's a Southern-Fried Genius and your preconceived notions about southerners just made you think he sounds dumb.
Parodied: Bob is portrayed as the typical nerd stereotype (glasses, pocket protector, bad fashion sense, etc.) but he is somehow capable of beating down an entire army while chuckling like a dork.
Zig Zagged: Bob is a nerd who gets bullied so he Takes A Level In Badass and works out, learns some martial arts, and otherwise toughens up. He casually beats down his former bullies but his sudden turn as a Bad Ass goes to his head and he stops persuing academic persuits. When someone makes him look like a fool in a battle of wits, he realizes he has to get back to studying.
Bob is just as weak as he looks, and has no physical prowess whatsoever.
Bob is stupid and incompetent.
Enforced: The writers wanted to defy stereotypes.
Lampshaded: "You may look really weak and into books, but you're pretty tough."
Invoked: Bob, bullied for his brilliant grades, decides to train in kick-boxing to defend himself.
Exploited: The chess club uses Bob's fighting skills to get back at a Jerk Jock.
Defied: Bob wears contact lenses and bulks up so he'll look more like a badass and less like a bookworm.
Discussed: Alice and her friends talk about Bob's mental and physical prowess, trying to figure out which is more impressive.
Conversed: "I love this character. He is smart and badass."
Implied: Bob is the top of the class and takes martial arts classes.
Deconstructed: Bob is really smart but his constant fighting gives him a poor reputatiuon amongst other intellectuals.
Reconstructed: That is, until he performs a study and writes a long essay about his findings, detailing the benefits of being both badass and intelligent. He gets his respect.
Played For Laughs: Bob beats up the Big Bad while schooling him on the finer points of quantum mechanics.
Played For Drama: Bob is an intellectual who would rather be left alone but he is thrust into violent situations which call for more "savage responses".