gyup Share definition Flag another word for yup, used mostly when your fucked up and you want to express something that is sweet. sounds better when you stress the g and say it in a raspy voice "that was some dank bud man" "gyup" "you see that tight ass?" "gyup dude" gyup by stebbs December 22, 2008 0 0 Get merch Get the gyup mug. Buy Now — $32.95 See more merch