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Noun: The fat obtained from overindulging, typically in alcohol. It is likely the root of the freshman fifteen.

Adjective: Describes general bloating due to partying. Targeted areas include the stomach and cheeks, but long term partying can lead to an overall increase in body fat.
Girl 1: Does this dress look good on me?

Girl 2: ...looks a bit tight.

Girl 1: I wish I could lose my baby fat.

Girl 2: That's not baby fat, that's party fat. Quit going out every night and do some sit-ups, you're starting to look like a fat bitch.
by McSantos April 21, 2009
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