After an erection, when a guy's penis returns to a flacid state, it shrinks, or "folds up."
Dude, Brock's penis will fold up to half that size.
by If only you knew... September 12, 2016
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When a person falls after getting hit or gets sick and doubles over
That guy folded up after I hit him
by Chewie1984 September 23, 2015
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Spending time with your friends/family and having a blast while doing so.
I was folding it up with Maxwell at the rugby game last friday.
by Swazuly February 6, 2015
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