I would say that a thickness of 2 ins diameter and a length of 11 ins would count as a supercock.
1991 — Adam Zameenzad, Cyrus Cyrus, Viking (1991), →ISBN, page 223:
[…] want any 'rich superbitch getting her bejewelled mitts around your poor supercock and swinging you around Manhattan until it's drained dry and limp forever'.
2008 — John Butler, Heels Over Head in Love, STARbooks Press (2008), →ISBN, page 133:
[…] and only then after my mouth had been cruelly — yet delightfully — stretched by his driving supercock.
2008 — Jon Horn, Dr. Onan, Olympia Press (2008), →ISBN, page 149:
I stuck my still-hard supercock up Trixie's dripping wide cunt, […]
Two other famous supercocks — those of Jeff Stryker and Cody James — were similarly shaped, but Gundo's magnificent meat was considerably longer and fatter than Jeff's, and close to an inch longer than even the fantastically endowed Cody.
2010 — Jim Izrael, The Denzel Principle: Why Black Women Can't Find Good Black Men, St. Martin's Press (2010), →ISBN, page 140:
The problem with the argument about the absentee daddy is that in order to buy into it, you have to believe that black women are dumb as rocks, […] and that the black supercock is a mystical one-eyed wonderweasel that mesmerizes and hypnotizes defenseless young black girls […]
[…] he has completely forgotten the unfortunate episode about his scientifically-bred gamecock and says to him that now he has a rooster that is not only a supercock but a real killer as well, that can "knock the stuffings out of two roosters at the same time."
1959 — Alejandro Roces, Of Cocks and Kites, and Other Short Stories, Regal Publishing Co. (1959), page 61:
[…] You know, I could understand your anxiety if you were betting on just any rooster. But when you wager on a supercock like this, why, it's just like putting your money on San Miguel."
1964 — Leonard Casper, The Wounded Diamond: Studies in Modern Philippine Literature, Bookmark (1964), page 54:
There are the hermaphrodite who slays an entranced opponent, the supercock who stabs himself by mistake, the cock who wins by rigor mortis, the king cock brought down by his crown, and so on.
The sensation of the evening matches was the seven-o'clock battle between two "supercocks": a Chiongbian Cobra (it was a Hulsey Gray champ) and a Garcia-Dalisay Davao.
