1. when a skirt rides up, there for revealing underwear/under garments.

skirt+up= skup
Jenna: Did you see Becky? she totally just skupped, and I totally saw dora undies
Molly: You almost feel bad for the skupper
Jenna: right, I would hate to skup in front of Ronny
by ForeverAMAZING December 24, 2011
Another word for "skipped" but only in the context of skipping class. (And being good at it, never getting caught)
"That's her third skup class!"
"And she still hasn't been caught!"
by pinkdoggyo January 05, 2010

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