A. Shoving your nut into an asshole

B. Someone who is being a moron.
"OMG, she was so kinky I made two dirty grapes"

"For Fuck sake, stop being such a dirty grape"
by ematz December 4, 2014
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When you shove 10 or so grapes in your butthole and cover it with grape jelly then someone tosses your salad, fruit salad in this case and you push out the grapes during the act. Provides a snack to the giver and exiting enjoyment to the recipient.
They were doing a dirty grapes in my living room and got caught, assholes ran into my bathroom an used my towels to clean up!
by GinanJuc November 1, 2023
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When you put grapes on a string and insert them into someone's asshole. That person then squeezes their ass, crushing the grapes while the first person drinks the dirty grape juice.
Mike put the string in her ass and rubbed her pussy, causing her to orgasm. She then squeezed her asshole while Mike licked up the dirty grape juice.
by Alsex27 October 17, 2016
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