The phrase comes from Neapolitan dialect mixed with Italian youth slang, where frà is a casual way to say brother and the rest is a vulgar comparison used for mockery. Clips like this circulate mainly through Italian social feeds and messaging chats, where short dialect insults are shared as ready made reactions. Its popularity rests on delivery rather than a known film or show source, and speakers who do not know Neapolitan still reuse it because the tone alone signals disbelief, teasing and secondhand embarrassment in just a few seconds.