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The phenomenon whereby groups of males suddenly appear out of nowhere due to the presence of attractive women, free beer, a neighbor's barbecue, running power equipment, or anything else that would draw men like flies.
--That's strange...It was all hot chicks in here just a minute ago when I got up to use the terlet, and when I came back, the bar was swarming with guys!

--Classic case of maninfestation! I saw it on Discovery Channel.
by palabrajot October 05, 2010
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