Someone who commits the act of showerbation. See "Showerbation" for reference.
Colin is such a showerbator.
A showerbator is someone who masterbates only or most of the time in the shower. This sometimes results in them getting an erection everytime they get in a shower.
1 : I got caught measterbating again last night, how do you never get caught?
2 : I only masterbate in the shower
1 : Your such a showerbator