Top Definition
When someone is banging some dirty/slutty dude or chick.
Dude, I think Mike is catching crabs in the other room.

SMS: yo, stop ignoring me... what are you catching crabs right now????

Fuck it, I'm catching crabs tonight.

Cindy totally went catching crabs last night after she left the wedding.
by nicoleta paleta May 20, 2011

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