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he is a large egglplant character created by mcdonalds to increase consumption of eggplants worldwide in an effort to promote the essential value of eggplant
grimace is a worldwide example of eggplant neglect
grimace by dax5246 October 23, 2007
Another word for a big plump (fat) chick.
Mark: Why didn't you hang with that chick last night?

Joe: Fuck that bitch, she was Grimace.
Grimace by Bizzleknowlege January 13, 2009
A failed attempt to clone Adolf Hitler. Seen on McDonalds commercials.
Grimace is an aristocratic bastard.
Grimace by Bovis May 14, 2003
A grimace (as explained in a video by You tubers Weasel Horizon) is the act of penetrating a females anus with a dildo (preferably a purple one) with out any lubrication. The act will cause the woman to grimace.
Karin started to fuck Ami in the ass with that purple dildo during the orgy but forgot the lube.
Jordan: {while snorting molly} DAMN! She givin' that bitch a grimace! SIM GIRLS!
Grimace by J-Reck Tha God January 4, 2015
the ex-mascot of mcdonalds who had a thing for stealing milkshakes untill ronald MCdonald became the new mascot and cut grimace's arms off for stealing.
me:"ever noticed how grimace used to have four arms?"

dave:"its common practice to cut thieves arms off where ronald comes from"
grimace by hay im mud October 16, 2008
A fat chick that wears a purple sundress or any other "Grimaceesque" type clothing (anything purple, even shoes)
Jamie shouldn't of worn that purple dress, she looks like a God damn Grimace!
Grimace by P.O.P. II May 21, 2010