The Term became popular in United States by a random kid saying it. Only on Wednesdays means that it only happens on Wednesdays.
by OnlyOnWednesdays June 1, 2012
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Basically means exaclty what it sais, only on wednesdays. Created by a group in Toronto, to try and make wednesdays the best day of the week.
Guy 1: "She's pretty hot, but only on wednesdays."

Guy 2: "Yea, every other day is pretty brutal."
by TheGreatestGoon December 31, 2011
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