Top Definition
To have sex with a women when she's on her period. Red is the color of blood/Soviet Union. A submarine is very much shaped like a penis. Hence, Soviet Sub. Can be used in past and present tense.
"Dude, I Soviet Subbed her like crazy last night!"
"I was Soviet Subbing this chick, and..."
"Baby, you wanna... Soviet Sub tonight?"
by Arius April 30, 2008
Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from We'll never spam you.