Grimace is a big, loving, fuzzy purple fellow who is Ronald McDonald's best friend. He's sure Ronald is the world's ultimate authority on everything. While Grimace loves all McDonald's foods, he's absolutely crazy about milkshakes. Grimace is very enthusiastic and eager to try new things. His joyous spirit helps everyone overlook the fact he's a little slow and clumsy sometimes.
a Grimace is a fat african american girl who comes to parties and tries to make out/hook up with anybody and everybody (male and female) at that party. It is a comparison to the McDonald's character Grimace.
John: "Dude how was that party last night?"
Dave: "It was fucked, some Grimace showed up."
John: "EW MAN. you didn't make out with her did you?!"
Dave: "Fuck no dude, I let her have some random drunk chick."