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To have sexual intercourse; typically associated with manipulative, deceptive, or unemotional sex, but can simply be used to describe the activity if one feels uncomfortable with using the word "sex." The "J" refers to the slang term for vagina: "VaJayJay"
"What did you do this weekend? Rip a J?"
"Hell yeah, man."
by Explosive Potato January 23, 2012
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