The phrase comes from everyday slang heard in Muslim and multicultural youth culture in the UK and online, where wallahi is used to demand honesty or express shock. Clips of people saying say wallahi spread on TikTok and YouTube as a reaction to lies, dares and wild claims, often paired with the classic bruh reaction. Remixes chopped the line into a loop, helping it travel beyond its original clips. It remains popular because the wording is instantly recognisable, easy to imitate, and fits almost any unbelievable moment.