The Chaos god of anger, rage, and bloodlust has demonic servants called Flesh Hounds...or, in other words, Khorne dogs. And also"the dogs of war" from Shakespeare's Julius Caesar.
When you're playing the game, all distances are measured in inches.note Or, rather, Imperial units.
Orks, due to how they reproduce, are known to have left their spores on a world that utterly defeated them, and their descendants will rise—but without the infrastructure or know-wots of their ancestors, meaning they become primitive Feral Orks. In other words, the Imperium can congratulate themselves on having bombed them back to the Stone Age.
One of the oddities in the Space Wolf geneseed is that it causes their canines to slowly but steadily grow as they age. The Wolves' seasoned veterans are called Long Fangs, and since they've been around for a few centuries, they have, well, long fangs. Because of their age, you could also say they're long in the tooth.
In Exalted, the Yozi Hegra, the Typhoon of Nightmares, produces hallucinogenic weather...or acid rain.
Malfeas, the Demon City, has a charm called Nightmare Fugue Vigilance, which means he doesn't have to sleep. That's right, Malfeas is The City That Never Sleeps.
Cards Against Humanity expansions sometimes contain cards that seem irrelevant to the theme of the expansion. For example, there's the white card "Pandora's Vagina" in the Box Expansion, and the white card "Gender Equality" in the Fantasy pack.
In Dungeons & Dragons, there's a monster that resembles a bear covered in damp pink skin and teeth (no fur or eyes or anything, just teeth)...or, in other words, a gummy bear.
The spell Detect Thoughts requires a material component: a copper piece. That is to say, a penny for your thoughts.
The Solid Fog spell requires powdered peas and an animal hoof. You're literally creating pea soup fog.
The calligraphy wyrm of Pathfinder is type of tiny dragon created by sovereign dragons to serve as lorekeepers in their lairs, that can also transform into writing instruments. It's both a book wyrm and a pen dragon.