The art of eating a lot of food to gain muscle mass. This art form is commonly used by people who are overweight or obese as an excuse to eat a lot because they recently bought a gym membership.
"Dude isn't that your like 8th burrito? Your going to get fat."

"No dude it's alright, I'm bulking up. I'm going to need it later for when i work out"
by Kaistianity January 26, 2012
Get the bulking up mug.
A male definition. Adding muscle mass or weight by going to the gym frequently and eating a high-protein diet.
Q: Dude, why are you eating so much meat?
A: I'm trying to bulk up.
by Stud April 12, 2005
Get the Bulk Up mug.
The act of which someone of Bulky nature becomes enraged.
Watch it man, he's Bulking Up
by Petorius March 7, 2005
Get the Bulking Up mug.
After eating the concealed pizza, I grabbed the bog and proceeded to bulk up
by Raeburn June 11, 2006
Get the bulk up mug.