Top definition
When you give someone rough anal sex that makes they're eyes water like they have been peeling onions.
I gave Mandy a dirty onion last night.
by blongly January 07, 2008
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2
When someone gets fucked up the ass and then proceeds to suck off the same person who has just done them up the bum.
Last night Kate got did a dirty onion.
by jsizz July 31, 2006
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