What is Jack-up?
1.
To jack-up is a gymrat term for working to improve a specific muscel or set of muscels, especially women who want to firm-up their butts.
She is doin something to jack-up that ass. I'll bet she spends an hour-a-day on the stairclimber."
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1.
A form of female masturbation.
A female will rub her clitoris in a circular motion, resembling a DJ, or disc jockey.
Dude, I was going..