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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.
by SpaceRat August 09, 2017
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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."
by Penny.F March 05, 2011
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