A derogatory slur against caucasian (typically heterosexual) males, originating from the Caucasus mountains meaning an overall bad person with "a penis so miniscule as to make a man unable to satisfy woman of any weight"
It has also been thought the word is derived from the french carcasse used when referring to early 1800s sick and dying Americans near Canada's border.
straight caucasian male: that guy is a fucking Carc (Cark, Carke).
bi non-caucasian female: yeah def a Carc.
straight caucasian male: Woah! you can't say that!