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To unwanted contact near a general genital area. Annoyingly rubbing or touching the leg close to the groin; or the shoulders and/or stomach near the breasts.
Girl one: Did you see Jim at the party last night? He was all over Cathy!

Girl two: Yeah, and he kept trying to perturbate her; you could tell she didn't like it.
by Wolfwitz February 11, 2010
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