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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 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