1. annoying mobs(baddies) found in video games.
2. an annoying, lazy, or ugly person.
3. any decapod crustacean that agitates you.
During a video game:
-Slay that crab.
-God! fuckin' crabs.
-A phone rings...call is ignored
person a: who was that?
person b: some crab.
-"Dude did you see those crabs in the car ahead of us?"
At the beach:
-"fuckin crab nigger tryed to pinch my ass."