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When a girl becomes so fat, her ass becomes flat. May also transfer fat to the crotch.
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by Hemeroid McGee June 04, 2018
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The point at which a girl is so fat that her ass becomes flat, additionally that ass fat may transfer to the crotch in some cases.
Damn, Shelley has reached the plain of fattitude.
by Hemeroid McGee June 03, 2018
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