The mild pain felt after masturbating many times in one day.

Caused by the constant tension of the Penis Muscle, could also be caused by keeping the penis in an unnatural position.
(Basically, it's just because Person A has had an erection for a long time)
*Start Call*

John: Hey fam, I met this sket Jane, wanna go shag her tonite?

John2: Nah fam, I got Cock Strain init.

John: Fuckin' Ell John2, You need to stop jackin', ya' feel me?

John2: Yeah sorry Bruv.

*End Call*
by Clownshitter November 2, 2017
Get the Cock Strain mug.