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.
The raunchiest sexual position in existence. Some believe it to be a myth, like woman's rights.
Guy: What's that smell?
Oth..