When you have McMaster history homework and you procrastinate by masterbating, wasting precious time needed to do work.
I had a ton of homework yesterday but I decided not to do it and McMasterbate instead.

Hey Evan last night I McMastebated all night!
by AdmiralWolverineLightningbolt January 10, 2010
Get the McMasterbate mug.
One who McMasterbates.
Person 3: Where is person 2?
Person 1: He ran to the shitter to McMasterbate

Person 3: Hahaha. Person 2 just can't help himself. He's such a McMasterbator.
by Atheist_Pirate July 14, 2016
Get the McMasterbator mug.