Engine Underpants

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!"