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When you hook up with a random or someone you're not particularly attracted to at a party then think you genuinely like them for the next few weeks so you don't feel like a slut.
Usually caused by hooking up with someone because you're drunk and applies mainly to girls, because boys aren't ashamed at hooking up with randomers.
Girl 1: "I think I really fancy Dan"
Girl 2: "No way, you've just come down with a generous dose of Party Shame, you'll be over it by next week"
by Eff.Mac March 06, 2011