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A small valve or faucet used to drain or reduce pressure, as from a boiler or radiator.
Before you remove that radiator, open the petcock and let it drain.
petcock by Reaper October 13, 2003
Related Words

pincockio 

a pincockio is when a guy gets a tattoo of pinochio around the base of his cock so that when he gets a hard -on it looks like pinochio's nose
when that bitch gave me head, she was looking my pincockio right in the eyes
pincockio by gene kelly 12 November 8, 2007

Pidcocked 

To have failed.
That politician Pidcocked
Pidcocked by Snugtal January 7, 2020

Pitcackle 

For ones anus to have a "blowout" whilst in a scrum during a game of rugby.
You can't fool me, that was a pitcackle.
Pitcackle by StolenAnchor September 5, 2009
A pincock is an offensive term for russian women.
Pincock by Faptastic Master September 25, 2018
To stroke the cock with a petting motion. This is typically done to make the cock stand alert.
That bitch was trying to get my attention so she pulled the ole petcock and I stood at attention immediately.
petcock by Estes June 28, 2011