Referring to the time around Halloween when young women use the holiday as an excuse to dress like sluts without any repercussions. The term was popularized by youtuber Philip DeFranco.
Horny guy 1: "Dude, you pumped for the slootpacolypse?"

Horny guy 2: "Yeah, I heard Stacey is dressing as a cat." *sexy meow noise*
by NightHawkCommander June 29, 2013
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