extended shower

When one takes extra long in the shower because he/she needs to masturbate either in, before, or after the shower. Often happening when a guest has his girlfriend over at the host's house and gets action resulting in blue balls.

Dude 1: Dude, why did you just take a 30 minute shower at 3 O'Clock in the morning at my house?

Dude 2: Sorry man needed that extended shower.