brain monster 

referring to ones scrotum when squeezed with a fist like motion

i showed my mother the brain monster when she was in the hospital, she was embarrassed when she looked at it

brain monster by kinnard February 22, 2008

the brian monster

A sexy beast who is gay but in denial and secretly wants to nail his best friend

Paul is the Brian monster

the brian monster by Gay bastard fart June 26, 2016