Green’s Dictionary of Slang

wesh! excl.

[Algerian, est-ce que, is that? and Moroccan qu’est-ce que, what is?]

(orig. Fr. but moved to UK rap;) used as form of greeting, e.g. ‘what’s up?’, ‘what’s happening?’; thus in France, un wesh wesh, a fan of urban culture.

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[UK]Central Cee ‘Bolide Noir’ 🎵I'm in Paris, trying to drop rizz / But they don't understand 'cause they're speaking French / Why she keep on saying ‘wesh’?
[UK]Connexion 11 Oct. 🌐 Wesh is a very informal word, used by young people as a greeting or interjection - a form of saying hello, or complaining or expressing surprise about something.