Devils Inch 

When fucking a girl doggy style you reach back and pull ur sack back making ur cock an inch bigger.

My girlfriend came like crazy whhen I gave her the devils inch

Devils Inch by jethro_sanchez June 11, 2010

the devils inch 

the act of pulling ones own scrotum back away from the penis while performing intercourse, to make the appearance of a longer penis

I was hitting this girl from the back and I gave her the devils inch

the devils inch by andre April 24, 2005

Devil's Inch, the

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.

She kept moaning for more, so I gave the bitch the Devil's Inch.

Devil's Inch, the by C. Shawn Sapriken August 10, 2004

Devil’s inch

The act of pulling on your balls from behind giving you that extra inch.

As she longed for it to go deeper, she gave a firm tug to give her that extra devil’s inch.

Devil’s inch by Boogdog January 31, 2019