Cumderpants 

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.

Cumderpants by Schillbj April 20, 2009

cumderpants 

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."

cumderpants by i love bj March 25, 2010

cumderpants 

where people have sex and at least one of them still have underpants on

person 1: “did u hear stacy got cumderpants last night?”
person 2: “dude no way”

cumderpants by grannymartha August 7, 2020

chunderpants 

Underpants or panties which are never washed and worn until bodyrot sets in and removes them from all existence.

She peeled off her ragged dress and I reeled at the sight of her filthy chunderpants; monkeys keep their cages cleaner.

chunderpants by Nubba the Wandering Minstrel April 17, 2007

crumbderpants

When you get crumbs in your under pants

After eating graham crackers on the couch , I stood up and had the unfortunate recognition that I'd developed crumbderpants!

crumbderpants by evilmissyann July 19, 2017

bumderpants 

Any variety of underpants where the buttocks are visible due to the fact the fabric has gathered into the butt crease revealing the cheeks.

Man these bumderpants are giving me an enormous wedgie!
These bumderpants keep riding up my ass crack - ouch!
I can see her bumderpants through that sheer skirt.

bumderpants by Ran6da September 15, 2017