Green’s Dictionary of Slang

(US teen) cheerful, satisfied.

1941		‘Digg Mee’ ‘Observation Post’ in N.Y. Age 15 Mar. 9/6: Florence Fiveashe hasn’t been any too well of late ...maybe Emmett Bennett can make her ‘strate’...she believes him sent from heaven above.
1993–2003		Studtaco Urban Dict. 🌐 straight All set, good to go, pearl. You okay man? You got hit kinda hard there. Yeah, i’m straight.
2002		Teen Lingo: The Source for Youth Ministry 🌐 I’m straight to declare that you are all right in your current state of being, as if to say ‘I’m cool,’ or ‘I’m good already.’.