Short for swagger, Swag is your style, demeanor, expressions, or the way you bring forth yourself in public/company. An individual having/possessing swag brings foward positive qualities such as being more socialable, noticable, and imitated. For males, swag can help them be more successful at finding a female counterpart.
Females can also possess swag. For them Swag can stand for:
There you go ladies. Now you don't have to get mad at me for not including y'all.
Guy 1: "Hey, man. I saw you with that chick over there."
Guy 2: "Heck ya!? She fine. Guess she noticed my swag ."
Son:"Well Dad, I finally got Keyshia to be my girlfriend."
Dad:"That's good, boy. I'm glad you did. I knew you had it in you. Who did you think you got your swag from? Like father like son."
Guy:"You was the bomb at the party. Everybody loved it!"
Girl:"Loved my moves? That's just my swag, boy. That's how I roll."
Further References in Pop Culture:
"Pretty Boy Swag" by Soulja Boy Tell 'Em (2010)
"Swag Surfin'" by F.L.Y. (2009)
"Swagga Like Us" by T.I. & Jay-Z ft. Kanye West and Lil'Wayne (2008)
Darrel: You got so much dick in your ass
Assface Magee: Fuck you, SWAG
Me: 'That's because you're a fucking retard trying to be like the rest of the try hards thinking their dumb ass have swag.'
The word quickly made its way to the states and has ever since become the catchphrase of douchbags and tools everywhere.
Person 2: "You're a dick"