Used by the Ancient Egyptians to describe un-natural underpants movement.
"My gosh Tutankhamun, look at those terrible spooky underpants outside, they are dancing"
by Jordan June 7, 2004
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In sexual situations, especially those including 3 or more members, the sole individual appointed with the task of deciding if, when, and how each person's underpants (including their own) should be removed.
Although Isaac was the Underpants Captain, Zooey violated the rules by taking off her own underwear...so Audrey and Michelle kicked her out of the orgy.
by VivaLaHST February 20, 2012
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Engine Underpants / ˈɛn dʒən • ˈʌn dərˌpænts /

Also known as " Creepers / ˈkri pərz / "

Any type of undergarment with a tendency to repetitively ride up your butt crack, with the power and reliability the of a steam-engine train riding the rail to the express tunnel, leaving you unhappily maneuvering it free and/or pulling it out like clockwork.

*Insert mental image of Thomas the Tank Engine Boxer-Briefs >>Here<< .*
I.E.

Friendo
" Why d'you keep walking like a freakin' crab person today..? "
Other Friendo
" -Shut up, I got some "Engine Underpants" on right now, they just keep ridin' up on me and it's driving me bonkers!"
by Pfeffernüsse Schädenfreude September 20, 2022
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A phrase mocking any token or procedure the possession or performance of which invests a person with arbitrary authority.

It's a nod to the specific criteria necessary for the Pope to be said to be exercising Papal Infallibility -- and so be speaking for God. Without fulfilling the criteria he's just a man in a funny hat and can be as wrong any anyone else.
"I don't need to look it up. I'm wearing my infallible underpants."

"For Christ's sake Bob, you've a clipboard not infallible underpants."
by jamiebabe July 21, 2015
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snap and he will be right there. from the comic book. at first a grouchy old principle until he was hypnotized.
TRA LA LAAAAAAA
Help me capitan underpants
by rodimus_prime2426 June 8, 2017
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When you try to fuck a math teacher and she makes you do sohcahtoa for the entry of penis on her panties.
I heard you need to fuck her in the sohcahtoa underpants position.
by Sohcahtoa January 23, 2021
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