main vain 

Main vain refers to a penis. A mans main vain.

"dude, i gotta go drain the main vain" meaning he needs to urinate, piss.

main vain by justout October 2, 2006

Main Vain 

Also known as the penis. There is no muscle in the penis, the penis is erect by a massive rush of blood. Therefore another nickname for the penis is the Main Vain.

Don't use the brain, use the Main Vain!

Main Vain by Butcher Jadali August 27, 2009

Drain the main vain 

1. The act of releasing urine from your penis.

2. The act of releasing semen from your penis

I drained the main vain all over her.

Well, time to drain the main vain

Drain the main vain by Nttm May 19, 2010

drain the main vain 

as in you need to go urinate(av a piss).

B: aw ive drunk too much. coming to drain the main vain?
C: yer sure...

drain the main vain by gareth matthews February 1, 2007

railing the main vain

Snorting a white powdery substance off a fully torqued penis

did you hear about Leslie!? last weekend she was railing the main vain on a cruise ship and now shes married to a 65 year old millionaire.

railing the main vain by Jerry Himself August 2, 2017