The line comes from Mamma ho perso l'aereo, the Italian release of Home Alone from 1990, where Kevin watches a black and white gangster film called Angels with Filthy Souls. In the English version the mobster Johnny ends his confrontation with the famous filthy animal insult, and the Italian dub gives that moment as lurido bastardo. Clips of the dubbed scene circulated on Italian meme pages and soundboards, where the short delivery was cut out and reused as a standalone reaction for anger and disgust.