Eating a medium dominoes pizza on a Sunday night to increase your weight for the rest of the week to lift more and gain more muscle mass
Garrett- Hey billy why the fuck did you eat a whole pizza by yourself?

Billy- I’m dirty bulking for the week bruh, you should try it sometime fat ass.
by Derogatory term April 9, 2019
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A specific strategy for gaining mass in which one lifts weights regularly and consumes any and all types of food, specifically junk food.
Dude, did you just eat that entire cake?! I thought you were trying to get in shape?

It's OK bro, I'm doing a dirty bulk. Don't hate.
by Gainz4Life April 30, 2016
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Getting buff by eating Fifty Big Macs a day to fuel your metabolism.
He looked like he worked out a lot but it was just dirty bulking
by Somerandomitiot March 16, 2018
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