Ojisan koubun, literally old man syntax, is a Japanese internet meme describing the distinctive way some middle-aged men write online messages, with excessive emojis, katakana emphasis, forced cheerfulness, and overly familiar closings. It spread through social media posts, comedy sketches, and parody screenshots that exaggerated the style for humour, and it remains recognisable because many viewers have received a similar message themselves. Creators now use the voice and phrasing as shorthand for that awkward, well-meaning tone in memes, reaction clips, and short comedy edits.