To deliver aggressive, comatose inducing sex to a female. Also know as "breakin' backs". When eating Alaskan Crab, you break the crabs back. Hence, when you break a chicks back, she got "crabbed". Can be used in different verb tenses also.
by New Shoes July 21, 2006
To crab is to steal or take something that isn't yours or to 'pinch' it. People changed from using the verb to pinch, to use the word crab as this is the thing a beach crab would do.
by fezza March 15, 2015