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1.
1. Small creatures from South Park that have to go to work. They work all night and they search for underpants! They won't stop until they have underpants.

Why do they do that you may ask..For profit of course. They have just not quite figured out phase 2.
2. They can mostly be observed in Tweak's room all hours of the night.
phase 1-get underpants
phase 2- ??????????
phase 3- $$$PROFIT$$$
by Tweak's coffee July 07, 2005
 
2.
A gnome who steals your underpants while you sleep.
Robert Farmery
by Ad May 17, 2004
 
3.
1. Underpants Gnomes are small beings that come to Tweek's room at 3.30 in the night to steal his underpants, Tweek sees them, because he can't sleep - ever !

2. The gnomes steal underpants to make profit. How ?
Like this:
1. Collect underpants
2. ?
3. Profit

3. They even have a working song, like the 7 dwarfs.
Time to go to work !
Work all night !
Searh for underpants hey !
We won't stop until we have underpants!
Yum tum yummy tum hey !

Watch South Park, season 2 episode 17 - Gnomes

Tweek : They're taking my underpants!

Kyle : Will you stop with the Underpants Gnomes, Tweek, we have to work her..
by Rikke K.. November 09, 2006
 
4.
Small characters made up on the show South Park. The underpants gnomes are small gnomes that sneak into your house at night to steal your underpants and somehow make a profit out of it.
Gaaaaah! The underpants gnomes are stealing my last pair of tighty whities.
by Sidney Vicious April 23, 2003
 
5.
An underground group of elite gnomes who conspire to reap huge profits from the theft of underpants.

Their diabolical scheme has thus far gone undetected, but with a growing wave of underpants shortages across the western U.S, expect the price of underpants to surge to unimaginable levels.
"No i did not forget to pack my underpants, the underpants gnomes stole them."
by basscrr November 12, 2008
 
6.
did you ever loose a pair of underpants? well those damn underpants gnomes come and steal them in order of world domination...of the underpants world.
Holy shit...ahhhhhh...there arter me again...shit...god...goddamn you underpants gnomes!!!!!!!!!!!!!!!!!!!!
by TwEEk18793&*%$$#! June 05, 2003
 
7.
little gnomes that steal your underwear from drawers and even if you have them on!
The underpantsgnomes stole Billy Bob's underwear
by SaltyMcFog September 05, 2003