Copypasta
A block of text copied and pasted over and over across forums and chats. The name is a corruption of "copy paste" and the word emerged on English-language imageboards in the mid-2000s.
The form is usually an overlong, self-serious or absurd monologue that has become funny precisely through repetition — the point lies in the recognition, not the text. It differs from spam by being a social ritual rather than advertising, and from a meme by lacking variation: a copypasta is generally reproduced verbatim, sometimes with one word swapped to fit the context. It's also used as a low-effort weapon: the same text from a hundred accounts can drown a discussion or a hashtag without any single sender breaking the rules. Twitch chat is the most active habitat today.