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1) The size of one average derriere multiplied by four.
2) Any 20-plus size woman who insists on wearing tight spandex in public because it's "comfortable".
"That's some four-ass! Four of my asses make one of hers."

"Look at the cottage cheese thighs on that four-ass in the white spandex!"
by Lisa Kostik January 05, 2002
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