The slang, term, adlib, and acronym “SLATT” was coined by Young Thug. “SLATT” is 100% an original Young Thug adlib, “SLATT” was first used by Young Thug on “Some More” produced by TM88, Metro Boomin & Sonny Digital, which released on November 26, 2013.
“SLATT” has been used by many rappers since 2013 like; Playboi Carti, Gunna, Lil Uzi Vert, Lil Keed, Trippie Redd, and many more, but Thugger was the first rapper to use it and the first to own a custom “SLATT” Chain. The term was popularized in Atlanta, Georgia.
Young Thug has used “Slatt” on over a dozen songs.