Top Definition
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 11, 2005

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vomit - British army slang
After eating the concealed pizza, I grabbed the bog and proceeded to bulk up
by Raeburn June 11, 2006

The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt