To manually ruffle a garment presently being worn by another individual, particularly pants or leggings.
Child: I'm gonna frump up those pants.
Imaginative Approach Encourager: You're going to what?
Child: Just shut up and let my hands do the talking. Got it?
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A: So, what's Bryan up to tonight?
B: I think he's gonna study on the ground floor.
A: Yeah, that's what's up! I always knew that guy was an open book.
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