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11.
When someone goes down on a girl who has crabs.
Example 1: "I got that guy to go crabbing last night."
by MATT44E October 05, 2012
 
15.
When one fag blows his load in another fags ass, and then proceeds to suck out the jizz with a straw. AKA felching
hey fag 1, would you like to go crabbing?
sure fag 2, sounds great.
by Long Island August 13, 2004