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1.
It is when you write swag on one of your hands and slap the shit out of someone
guy 1: Yo Jimmy I'm gonna Swag Slap you

Jimmy: bring it mofo
by jswag95 November 29, 2011
 
2.
Thoroughly beating someone's ass in style, rather by means of verbal or physical persuasion of the highest and harshest degree.
Nigga, yo girl say you ain't shit but a bitchboy. No clue. No swag. No money. No style. You need ta be fuckin' swagslapped like tha lil bitch you are!
by iamtha1 August 02, 2009