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1.
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.
by Reaper October 13, 2003
22 6
 
2.
1. the #1 penis one is currently having sex with- no strings attached

2. the alternative penis one is having sex with while #1 cock is out of town
I need another pet cock until my pet cock comes back Monday.
by Bicycle101 November 05, 2010
6 1
 
3.
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.
by Estes June 24, 2011
2 1
 
4.
the cock of a pet
but its word is self explanitory
"mannn mai dogs petcock is pimpen all the dogs in the neighborhood"
by teddybangcock laulea May 04, 2006
6 17