Saco de bosta is a common Portuguese insult that literally means bag of crap, and online it is used as a blunt, comic put-down. The Bill version has circulated on soundboards as a named roast, which makes it easy to drop into chats and edits whenever a Bill is the target of the joke. Its appeal is its brevity and directness, so it works like a reaction button rather than dialogue. It stays popular because the phrase is instantly understood by Portuguese speakers and still reads as funny to others from tone alone.