wallahi!, excl. — Green’s Dictionary of Slang

wallahi! excl.

[Arabic wallahi, I swear to Allah]

(UK black) excl. of affirmation, committment.

2004		Urban Dict. 30 Oct. 🌐 wallahi i didnt take your hat. wallahi who do u think u are?
2022		Digga D. ‘Pump 101’ 🎵 Get him out the country, wallahi, I tried (Wallahi).