underfag

Someone who is waay to obsessed with Undertale. They often say "I'm filled with determination" or make skeleton jokes. Like the character, sans does. They also bring up Undertale way too much.

Friend 1: Wow dude, that episode truly was sans-sational!
Friend 2: Stop being such an underfag.

by DerpRunner October 7, 2016

Underage Girls

If You typed this in more than likely you are already a pedophile.

Johnny: yo dude you wanna go scoop up some underage girls at the mall this weekend?

Timmy: No dude i don't wanna go to jail you sick pedophile.

by phillippe vanderbilt May 18, 2010

undercrackers

underpants, duds.

ive got no clean undercrackers

by ipw June 9, 2004

underage user alert

To be yelled at anyone on forums who says something immature or stupid, suggesting a preteen poster.

Iamover18 : Liek Teletubbies r teh Rox
Sinner: UNDERAGE USER ALERT!!!!!!!!

by Kissingtheshadows March 25, 2005

Underfag

Any Undertale Player/Fanboy that meets the following Criteria.

1) Is obsessed and will go to any length to get the merchandise .
2) Is under the age of 10.

Guy A: God Damnit
Guy B: What?
Guy A: My little brother is such an Underfag

by ExtraShard July 4, 2016

Underage Drinking

Something that everybody does at one point in time but is illegal in the US until the age of 21.

Damn, i can die for my country but i can't drink a beer because it's Underage Drinking. Fuck. I'm moving.

by JohnDoeWantsToGetDrunk December 3, 2009

Underaged boy

Did u really just search underaged boys you better get off the internet the cops are on the way u sick pedo fuck

Jared: U want to pick up some underaged boys

John:no I’m calling the cops

by U are sick September 26, 2019