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1.
A popular pair of leather pants that motorcyclists wear. As the name says, they are assless, making it easier to advertise at biker bars.
Shaggy wears assless chaps when he plays Halo!
by Zapix March 26, 2004
 
2.
A type of leather pants (usually worn by bikers) that are little hit and miss. Or rather, miss and hit. They're missing the ass, which allows that ass to be hit.
Dude: What's the deal with your pants? They seem to be missing the ass, for hitting the ass.
John: Oh, yeah, I love wearing assless chaps! C'mon smack that ass. Mooch Mooch.
Dude: Um, yeah starts running as fast as he can in the other direction.
by Darbers April 13, 2008
 
3.
a brief escape hatch of someones ass in the rear end of there trousers orpants etc
a hooded night with a hole on his rear end (rectum) cutaway in pants trousers etc
assless chaps
by sucked duck August 20, 2008