Green’s Dictionary of Slang

to reject, to dismiss.

2016		The Cut (NY Times Mag.) Mar. 🌐 Nope out — When asked what nope out meant, Chloe said, ‘to dub someone’s shit.’ Uhh, what’s that? ’To curve someone,’ Chloe responded. ‘Like if they asked you to cyph and you don’t like them, you’d ghost them or just be like, Nah I’m good.’.
2021		Central Cee ‘6 for 6’ 🎵 Bad B’s, they curved the kid / Back then when I weren’t so lit, now I’m lit, they're pissed.