Green’s Dictionary of Slang

wavey adj.

(UK black) fashionable.

hubpages.com ‘Roadman Slang 10 Jan. 🌐 Wavey - when someone is looking very fashionable, following London trends.
genius.com 🌐 His hard lyrics, wavey flow, charisma on beat and deep voice make him stand out from much of the crowd in London.