Definitions by Crackheadfr

gup 

G AP
A term used when someone lies, makes a mistake, or is wrong about something

eg.

Person 1: that pole is green

Person 2: gup! It’s actually red

or

Person 1: dude I heard you slept with Jessica
Person 2: gup, I didn’t

gup by Crackheadfr June 17, 2019