Top Definition
An unofficial holiday that falls on November 13th. My friend and I thought of it in Home Economics when we were doing something with holidays and the only one left to choose was boring old Labor Day. The day is basically about celebrating the invention of the rocket ship.
Greg: Dude, you wanna go huntin'?
Doug: Naw, I'll stay home for Rocket Day.
by GIR needs rehab August 26, 2008

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