2 definition by Edward Franklin

Top Definition
One who is being a complete retard for no apparent reason, also quite similar to asshat.

May also mean one who is a jerk about nothing.
"Damn, Steve is being a real crabass about his fridge, wouldn't let me get near it"
by Edward Franklin January 01, 2004

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Two Possible Meanings
1. Either the ability to get ass from all women, therefore becoming master of the ass, can be applied as a form of admiration or possibly an insult (usually both).

2. Or a term for one who is skilled in the buttsex, may be applied to homosexuals.
1. "The Assmaster is out again"

2. "Yeah Steve is a real Assmaster isn't he?"
by Edward Franklin January 01, 2004

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