Pertaining to an individual who does not appear to be in possession of a rear end. Assless people tend to be extremely skinny or scrawny, and often are not aware of their lack of a behind.

(Can sometimes be abbreviated to 'ASSLSS' in text format.)
So that's Johnny? Woah, he has NO ass! Assless, right there.
by SSLA March 09, 2011
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A person who is the king or queen of not having an ass. One who is assless to an extreme.
Your asslessness astounds me!
by TimmPower December 30, 2009
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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
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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
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When one is too bored to just sit around.
"how're you?"
"bored assless, you?"
"lol assless? yikes.. sounds pretty bad."
by sarah awesome May 30, 2008
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