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Define Main Vein Meaning

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 Estrellita
The Main Vein
Penis

My bladder is so full I think its time to drain the main vein
By Gale
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 Nanette
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 Rosemarie
Drain The Main Vein
Slang for "Urinate"

"The Main vein" being the penis of course.

"I gotta drain the main vein something fierce"
By Marsiella
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 Jennette
Main Vein Pain Train
An event which occurs when one woman is with five men at the same time. One in the pink, one in the stink, one in the mouth, and one in each hand.

Did you see Jessica go off with those five guys last night? She must have ridden the main vein pain train!
By Loretta
Drain My Main Vein
to piss (=

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