Funderpants 

Underpants or knickers designed for quick easy access to the genital area resulting in the ability to executed "quickies" with the greatest of ease. Generally worn with the intention of a debaucherous night on the town.

I just want to go out and be dirty tonight. Might wear my funderpants

Funderpants by Mx Pwr April 17, 2009

Wailing underpants

Activities in the underwear that demand immediate attention either sexual or toilet related.

Palmer had to go to the toilet quickly due to his wailing underpants!

Wailing underpants by I, Wreckerrr October 30, 2016

Underpants journalist 

A journalist who writes about and/or dressed in their underpants. Often referring to bloggers or freelancers who work from home/their parents' basement.

"TMZ may have broken the 'Michael Jackson is dead' story, but they're still a bunch of underpants journalists."

Underpants journalist by Stable of Crayons July 21, 2009

junderpants 

jeans that are purposefully cut off short to be worn as underpants.

This never-nude wears junderpants in the shower.

junderpants by TimmerOU812 June 25, 2012

Underpants Gnomes 

From the TV show South Park. They steal underpants in order to make profit. They even educate children on how profit works. Here's how:
Stage One: Steal Underpants
Stage Two: ???????
Stage Three: Profit!

The underpants gnomes robbed my house again.

Underpants Gnomes by funwillfunwill June 20, 2015

Underpants Gnome 

A gnome who steals your underpants while you sleep.

Robert Farmery

Underpants Gnome by Ad May 17, 2004

fuckerpants 

alternate fan-based name to the song titled "Prince Caspian" by Phish. This secondary moniker came about as an expression of displeasure upon hearing the song, which is arguably one of the weaker songs played in a typical Phish set (also known as a bathroom-break song). Origin is unclear, though came into popularity in fall/winter of 1997. Tapes and setlists circulated among the fans commonly have this song listed as Fuckerpants instead of Prince Caspian.
Useage of this moniker seems to be more prevalent per-capita among Phish tapers than the overall scene.

1. "Dude, set two was raging until they killed it with Fuckerpants."

2. David Bowie > Possum > fuckerpants, Frankenstein, Harry Hood

fuckerpants by GrampsMI March 22, 2009