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1.
A mixture between "cunt" and "moist." Many women are other grossed out or severely offended by these words, therefore it's been combined.

Sidenote: "Cunt" can be alternated with "cooze," "clit," or any of your own C words.
I was gonna pound her slophole, but then her coist room mate came home and cock blocked me.
by CoistInAHat March 06, 2011
 
2.
An extremely cool person, who is a great friend to everyone.
I love her to bits, she's such a Coist.
by iAMthedancefloor July 30, 2009