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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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