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A reference to a woman's backside - specifically a really well-formed one. So called because, as we all know, crossing a mule and an onion results in "an ass that'll bring tears to your eyes".
"Damn, look at the mule onion on that one!"
by Heathen 2.0 April 28, 2008
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Cleveland Steamer Plush

The vengeful act of crapping on a lover's chest while they sleep.

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