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While in the famed doggy style position, just before the man is about to blow his load, he stretches back with his thumbs (of doom) pointing up in the positive gesture position, he shouts "thumbs of doom" and just as he blows off he sticks his thumbs up her ass.
my man thumbs of doomed your sister last night thats why she can't sit down.
by B-team April 12, 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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