What is Jack-up?
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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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Vegans (mainly members of PeTA) who don't have a slight clue of what's going on or getting thier facts twisted,warped or disto..
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a girl (or guy) that used to be really fat, but finally grew into their body and now looks pretty decent. They usually change from a nic..