Top Definition
A birthday celebration which occurs in Las Vegas, NV during the month of August. The official party is celebrated on August 10th or on the closest weekend to that date. If August 10th falls on a Wednesday, it is required that the weekend before and after August 10th must be celebrated. This celebration is in honor of the coolest person ever born on this date and named Megan - hence MEGApalooza!
Danielle: Are you going to Megapalooza?
Shelly: Of course! Only the coolest people will be there.
Rachel: LaLaLaLaLa
by Shelly216 September 17, 2008

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