Top Definition
Exercising hard, but not too hard, very often. Also called GTG.
Gymrat: Dude! How'd you put 50 pounds onto your bench so quick?

Dude: Easy, skinny Gymrat! I did a Grease the Groove by doing one set of about 5 reps near my max weight, every day before breakfast.
by Kurcules May 28, 2010
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