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Drain the main vein

Slang for "Urinate"

"The Main vein" being the penis of course.

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!
Rail the Main Vein by Blawkz February 9, 2015

To drain the main vein 

I need to drain the main vein...like right now. Is there an industrial area where I can do it on the street?