Top Definition
A female with very little or NO ASS whatsoever. Males will not be attracted to longbackasauruses at all.
Justin: "Man, Jess and Kyllie sure are Longbackasauruses."
Shayne: "Yeah, they have no ass at all!"
Grant: "Their jeans are baggy, that's how little ass they have"
by 69me February 01, 2010

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