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1.
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."
Por i love bj 24 de marzo de 2010
 
2.
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.
Por Schillbj 20 de abril de 2009