An acronym for Secretly We Are Gay because the word swag is the stupidest thing to be created by humans.
Group: SWAG!!
Guy: So you're all gay?
Group: NO!
Guy: Well obviouslyyou are because you just said "Secretly We Are Gay" even though it's not a secret anymore.
or:
An illiterate dumbass with his pants around his knees, and wearing a backwards pointing snapback who tends to listen to Lil Wayne, T.I. Chris Brown, and Drake.