The distance a man is able to comfortably travel (from his bed) without pants; the average radius being just the distance to the shower.

It is theorized that a man's underpants radius is inversely proportional to his confidence; that is, the farther a man travels from his bed in just his underwear, the less he believes in himself.
At first we thought it was funny; at least Marshall didn't left the house without putting pants on. But his underpants radius just kept getting larger. He started getting the paper in his underwear and even going downstairs for a drink in his underwear...!
by Knowingest J. Drawbridges December 12, 2008
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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 7, 2005
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The organized-crime syndicate secretly controlling the Underpants Gnomes. Secretly plots world domination, possibly with the help of the Crab People.
Phase 1: Steal underpants.

Phase 2: Unknown, but thought to be something along the lines of re-selling the underpants on the Japanese black market (which seems to, for whatever reason, have a huge demand used underpants), re-investing profits in the translation and distribution of hentai in America and eventually the rest of the world, thus driving the normal porn industry (and the desire to see non-anime boobies) into near-extinction, as well as creating a dwindling in the human population, thus eliminating humanity's only defense against the Underpants Gnomes (non-anime boobies). After this, continue stealing underpants, eventually achieving a complete underpants monopoly.

Phase 3: Profit!
by Natepalm October 29, 2003
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The most fucking sexy superhero ever. Wears underwear, screams TRA LA LA LA LA, can leap tall buildings without a wedgie, and wears a red blanket. In just a snap, he can turn from me in 30 years, to the man that all the girls will lay. He is truly the shit. He also has some little bitches named George and Harold who think that they can still his fame, but they're both wrong. He will go down in comic book history as the fucking hottest bald fatboy flying underwear-wearing caped chad superhero ever.
Chad: "Damn. I wish I was Captain Underpants
by Stupid Af June 20, 2021
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The excuse you should ALWAYS give to your girlfriend when she bitches to you about grabbing/slapping her ass.
Zach: (slowly reaches for a game of grab-ass)

Kim: What the fuck, Zach! We're in public!

Zach: Wha...WHAT!?!? That wasn't me! That was The Underpants Monster!!!!

Kim: Oh, I'm sorry for yelling.

Zach: Damn right you are! (slaps Kim's ass)
by AKKKHMED May 30, 2009
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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
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Just the coolest, most badass, thug, gangster, lord god commander who shed his clothing to battle his foes with fury of a thousand suns.
Man #1: Hey you are looking like a captain underpants kind of brother today
Badass Man: I know, I'm totally not a noob.
by TheKewlestKatAround July 12, 2015
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