Main Vein

The largest vein in the penis. Once the penis has become erect, the blue/purple vein becomes clearly visible.

"Seeing that chick naked got me so hard that my main vein was just bulging!!"

by PMchoisi June 8, 2009

Main Vein

The large vein that travels the length of a cock. Instrumental in delivering blood from the central artery during erection.

My cock was so hard, my main vein was swollen with blood.

I saw my heart beat as the main vein of my cock pulsated with blood.

by Tony from the Lido September 21, 2011

main vein

Penis.

Slang word for penis.

"Be right back, I'm gonna go drain the main vein".

"I drilled her with my main vein".

by mickyxtee May 9, 2009

the main vein

Penis

My bladder is so full I think its time to drain the main vein

by Xeroman January 31, 2016

Drain the main vein

Slang for "Urinate"

"The Main vein" being the penis of course.

"I gotta drain the main vein something fierce"

by Doc Evil July 24, 2003

Rail the Main Vein

To snort a line of cocaine off of a fully erect penis

Me: Yo, do you even rail the main vein?
12 year old on Xbox live: Yeah, fucker, I rail the main vein every day!

by Blawkz February 9, 2015

drain my main vein

to piss (=

i'll be right back guys i gott go drain my main vein

by dongsaucer (= October 30, 2008