Green’s Dictionary of Slang

(US) to reject.

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.’.