Phrase used to describe one's single relationship status. Most often when a guy breaks up with his girlfriend. Guys are ususally happy when they use this term. A lot of the time a guy who has his single swag on is hot, sexy, fine or all of the above.
Girl 1- Are Joey and Sara still dating?
Girl 2- No, Joey has his single swag on.
Guy 1- I love flirting and grinding openly with every girl.
Guy 2- Yeah i'm so glad i have my single swag on again.