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When you wake up in the morning next to a fat chick, invariably with a hangover fit to down an elephant (or the chick next to you).

invariably a pre-cursor to the walk of shame
Got pig flu last night, she could suck a melon through a hose pipe though so I kept her on for some 'morning duties'
by poijoy April 28, 2009
Comes from pigs.
Man: *Sneezes*
Man 2: Oh shit! You pig flu!
by thepigboy May 12, 2009