Top Definition
1) When two boys pull out their penises to see which one is bigger. Usually done by boys between 8 and 13. Anyone caught doing this after the age of 13 can be considered gay!

2) An excuse for a guy to look at someone elses cock at a urinal or in a open shower.
1. Hey Justin, lets go to my room and compare sizes.

2. I'm not gay, I was just comparing sizes.
by Kurt91 June 11, 2004

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

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