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A woman of large stature or weight, who is either skanky, slutty, a bitch, or a combination of the three terms. (Hippo is to describe the fat, and cat or "pussy" to describe her skankyness.)
Guy 1:That chick's a total Hippocat dude.
Guy 2: Why?

Guy 1: She's fat and is a total bitch, man.
Guy 2: Makes sense.
by Ramalus Riverdance March 01, 2010