Top Definition
The Monday immediately following a weekend during which an unusually high number of co-workers or fellow pupils get haircuts and come into work or school with notably different hairdos.
Matt: Yo look at Rob's haircut!
Chris: Dude FIVE people in my homeroom got haircuts over the weekend.
Matt: I guess it's Haircut Monday!
by feltonandkundla October 20, 2009

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