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
by Dr-T April 17, 2010
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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!"
by bigrod12 December 17, 2011
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This giant biological marvel baffles scientists worldwide to this day. She is like 5% horse and has about 10% of the world's cock mass. this exceptional specimen has been under research since 1902, when lila's descendants first discovered the prophecy of lila's descent. the horse god in human disguise, a cock that rivals that of a sperm whale. it is hard not to look at her absolute unit of a cock, it is so big that it generates it's own gravitational pull. try not to look directly at it or else there is a high chance of getting blinded. no mortal is capable of looking at it without facing the consequences. to mere mortals, the cock may look as bright as 1000000000 suns. #9inchcock
Lila's cock (9 inches) is scaring the children !
put your MASSIVE cock away!!
by Not Syun September 16, 2022
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