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.
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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.
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The anus, also known as the brown eye. What horny bitches like to eat out to serve as payment after being fucked really hard.
Don't fuck with JD if you have a nice looking wifey! He'll smooth talk her into some rough sex, give her a couple of donkey punches, and convince her to eat his dirty onion ring. After that she'll come home and give you a long, stinky tongue kiss.
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Bitch, stop lappin' on my balls and start eatin' my dirty onion ring.
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Someone who likes to sleep with multiple partners. A slut. Onions have layers (sluts get laid a lot by... layers).
Kristy is a dirty rotten onion.