Definitions by Dr-T

cock-inch 

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

cock-inch by Dr-T April 17, 2010