drain a vein

When you go to "take a leak."

Man...I drank so much beer that if I don't drain a vein now I'll explode.

Drain the Vein

To release a large amount of urine on somebody's face.

Be right back bro, I need to drain the vein.

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two can drain that vein

Just as two can play at that game, two can drain the vein of one's backed up semen.

Buffy: "Did you hear Lance challenged that more than one Ho is needed to make him climax?"
Candy: "Oh really? Two can drain that vein!"
Buffy: "Game on!"

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Drain the main vein

Slang for "Urinate"

"The Main vein" being the penis of course.

"I gotta drain the main vein something fierce"

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drain my main vein

to piss (=

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

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