Wanquilizer 

When you're unable to get to sleep so you masturbate to a climax, just to make yourself drowsy.

"I tried everything to get to sleep last night, in the end all I needed was a quick Wanquilizer and I was out like a light"

Wanquilizer by Mattaus Muller December 15, 2009

wankquilizer

When you wank into someone's mouth and you shoot your seed down their throat causing them to cough and pass out.

Man, I just gave a wankquilizer to my ex-girlfriend's new boyfriend.

wankquilizer by СукаБлять July 28, 2016

wankulizer 

The act of masturbating before sleeping to make yourself tired.

Jake: "I'm going to have a wankulizer and a nap before work"

wankulizer by Falconar September 14, 2012