The result of sliding one's cock as far into an orifice as it will go, then reaching behind and pulling back on the scrotum, which stretches base of the cock an extra inch.
When you have a girlfriend but someone’s taking a group pic and you have to put your arm around another girl, so you hover your hand an inch away from her body.
Guy 1:“Bro, what’s your girlfriend gonna think about your arm around Trinity in this picture!?”
Guy 2: “Relax bro I made sure to keep a gentleman’s inch”