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When you have a crush on someone for only about one day. It usually triggered by a nice conversation or a well put-together outfit, that makes you believe that you like the person, but it was only a momentary attraction. It can last anywhere from a few minutes, hours, to a few days.
William had a hormone day for Natalie, but it was just because she was wearing a low-cut shirt that day.
by deny-ée May 03, 2009
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