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."
"Your cumderpants. You don't want uneven flap disease."
by i love bj March 25, 2010
A soiling of the underpants resulting from a wet dream or accident during a lap dance. Common amongst teenage boys.
by Schillbj April 20, 2009
by grannymartha August 07, 2020