Top Definition
The act of peeing without holding ones penis. In essence the cock is control thus it is the master. It also asserts its dominance over other cocks who cannot achieve this feat, making it the greatest cock thus adequately named the master cock
Girl: Eww why didn't you wash your hands after peeing?
Guy: Its ok, I master cocked it.
by peppy the poopdaddy May 27, 2011

The Urban Dictionary Mug

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

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The Urban Dictionary Mug

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

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

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

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The mammoth cock that always seems to show up when on the website chatroulette.com
oh man i gotta find me som titties on chatroulette.com. OH SHIT! MASTERCOCK! PRESS F9 PRESS F9!!!
by roosterstroke March 07, 2010

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