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It can be negative or positive When you overachieved an expectations or you did better than expected.
Holly Holm needed to beat Ronda Rousey but she didn't just beat her, she Guiced her by knocking her out
Guiced by TheGuicer February 26, 2017
Related Words
A drink comprised of Goon, nasty cheap cask wine and juice, most commonly orange, pineapple, mango, etc. to mask flavour.

Better than Goon, worse than Juice
"pass the guice!"

"i didn't get the ratio of my guice right! tastes like ass."
Guice by Penny.F March 20, 2011
The maker of bruh moments, slayer of hoes and tramps. kicks ass, smokes hella grass, and sleds really fucking fast.

like a chad, chode, or bruv, but generic
me; "dude did you see kenny last night at the party"?
bruh; " Hell yeah man, hes a fucking guice"!
Guice by the magical E of oz April 27, 2020

Heavy Guice 

A phrase used to describe consuming large amount of marijuana and being high.
You know the routine on NFL Sunday is heavy guice and ordering door dash.
Heavy Guice by Darius Doison November 3, 2023
A type of parasite. Someone who holds himself/herself in the highest regard in spite of the fact he or she is an utter twatwaffle. The liquid left over in a douchebag after the douching is done.
Wow did you see Kenny trying to game that girl out of her tips? He's such a Guice.
Guice by SpaceRat August 9, 2017
The internet way of saying "guys". Also a way to sound retarded on the interweb.
"HEY GUICE WUTS UP"
Guice by GGQ February 13, 2009