Around three quarters of a normal inch (18.4mm). Used to describe the size of one's manhood and to make it apparently larger than it really is but has also been spread to wider applications.

4 cock-inches is the equivalent of 3 imperial inches.
Mark - My penis is 8 inches on a good day...
Russ - Is that real inches or cock-inches?

Alternative use...

Mark - Give that settee a shove it's only a cock-inch off where it should be
door Dr-T 17 april 2010
A unit of measurement that a man uses to describe the length of his penis to feel better aout himself. One cock inch (though varies greatly from man to man) is roughly .6 standard inches.
Guy: "Say girl, i have a ten inch dick,"

Girl: "Quit using cock inches to try and be cool, we all know your a sixer."

Guys friends: "OOhhhhhhhhh!"
door bigrod12 16 december 2011

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