To Pants someone but to pull there underwear down simultaneously weather purposely or on accident
Dude that kid got underpants in front of EVERYONE, they saw his junk and everything
Yo i was Underpantsing this and he punched me, It was a freakin accident i just wanted to pants him
the state of not being pantsed enough
Jock #1: Hey Jeff, check out Ben over there. He's way underpantsed.
Jock #2: Yeah, let's get him.
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