Green’s Dictionary of Slang

1. an excl. of affirmation, honestly! really! are you sure?; occas. as interrog.; intensified as damn straight! under damn adv.

1891		F.W. Carew Autobiog. of a Gipsey 416: Hevery bloomin’ hounce were snide, and not worth cartin’ away. Straight.
1900		‘Doss Chiderdoss’ ‘A Courting Case in Court’ Sporting Times 7 Apr. 1/4: Well, and what about them? Straight, it gives me the pip [...] to think Jimmy was landed / For behaving like every bloke does when he’s out / With his gal.
1908		Leigh & Powell [perf. Marie Lloyd] Rum-tiddley-um-tum-tay! 🎵 Girls, we had a grand time! Straight you've no idea! / I can’t tell you half, though; there's some fellers here.
1918		C.J. Dennis ‘A Digger’s Tale’ in Chisholm (1951) 100: I tells ’er, ‘Straight; I drives ’em [i.e. kangaroos] four-in-’and / ‘Ome in my land’.
1922		Joyce Ulysses 297: Blimey, it makes me kind of bleeding cry, straight, it does.
1933		S. O’Casey Within the Gates ii: Show ’im a little of the gaiety of life, strite, I would!
1943		M. Harrison Reported Safe Arrival 28: Funny, I felt quite weepy when them old gels give us the ‘i-de-o’ ... Straight I did!
1945		(con. 1937) R. Westerby Mad in Pursuit 150: He asked Mr. Goldstein if I could go in his room today. Straight!
1956		J. Curtis Look Long Upon a Monkey 30: I’m doing my nut, straight.
1970		E. Tidyman Shaft 103: Straight, Shaft asked.
1976		P. Theroux Family Arsenal 63: ‘Leave off!’ ‘Straight. Tight as anything.’.
1986		F. Taylor Auf Wiedersehen Pet Two 28: Straight? I thought he was goin’ to Saudi.
1997–2000		College Sl. Research Project (Cal. State Poly. Uni., Pomona) 🌐 Straight (adv. & adj.) 1. No doubt about it.

2. (US black) a general term of agreement.

1997–2000		College Sl. Research Project (Cal. State Poly. Uni., Pomona) 🌐 Straight (adv. & adj.) [...] 3. Fine; acceptable; ok.
2004		Eble Campus Sl. Apr.