What is Main Vein?
1.
Penis.
Slang word for penis.
"Be right back, I'm gonna go drain the main vein".
"I drilled her with my main vein".
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2.
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!!"
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