Bulk Up 

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.

Bulk Up by Stud April 11, 2005

bulk up 

vomit - British army slang

After eating the concealed pizza, I grabbed the bog and proceeded to bulk up

bulk up by Raeburn June 12, 2006