Hooking up with a fat chick.
Watch out for that chick man. You don't wanna catch the swine flu do you?
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Acronym for Potential Swine Flu. This refers to catching Swine Flu by hooking up with a fat chick. The chick herself would be referred to as the PSF.
That chick is a PSF. Stay away unless you want to catch the Swine Flu
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