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when someone is fucking and just when they are gonna ejaculate, they pinch their dick and all of the cum is still on the tip.

once u let go, it spills
my worm bag will spill any second, give me a cup.
by nasty shit November 23, 2004
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(n) Any human male with a collection of dilated blood vessels in his scrotum (see: varicocele, a condition which may interfere with fertility) who is otherwise extremely sexually and intellectually desirable.
I went out with that guy I met through Craiglist last night, turns out he's a wormbag! Hopefully that means he's never knocked anyone up.
by The____Liz February 04, 2010
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