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1.
Soul mate + Twin

Your swin is someone who talks like you.
Person 1 - "Hey, where should we go?"
Person 2+3 - "To McDonald's"
Person 2 - "OMG, Swins"
by Commilad September 25, 2007
 
2.
The Act Of Having Swag And Winning.
Lil B Is So #Swin

Your Girl Gave Me A Blowie And I Busted On Her Face #Swin
by Its Techno October 17, 2011
 
3.
a tune, especially an old, catchy tune, like "Oh My Darling Clementine".
I had some swin stuck in my head, but I couldn't remember what it was.
by markiand May 06, 2010
 
4.
the name given to the most beutiful girl in the world
swin is very precious to me because she is my first love
by no face February 12, 2005