Top Definition
A soiling of the underpants resulting from a wet dream or accident during a lap dance. Common amongst teenage boys.
Bob had a wet dream so his mom had to wash his cumderpants.
de Schillbj 20 avril 2009
cum or vaginal discharge on your underpants due to general horniness and presense of an active teenage vagina.
"Hmmm, should I wear Olivia's Bratz underpants or my cumderpants?"

"Your cumderpants. You don't want uneven flap disease."
de i love bj 24 mars 2010

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