Dirty words or suggestive behavior. In fact, this is a homophonic language, which is used to imply vulgar or obscene words, such as filthy words or implied behavior. Its origin can be traced back to Japanese. "Pineapple" means "filth" and "filth" means "filth". Therefore, when someone uses the word "pineapple" on the Internet, it is implying some indecent remarks or behaviors. The network language pineapple is widely used, especially on social media. Everyone likes to express their ideas in this language. Because it can be used to imply something you can't say, and it won't be considered impolite.