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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."
af i love bj 24. marts 2010
5 3
 
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.
af Schillbj 20. april 2009
3 2