OTT is a short, informal British way of saying over the top. If a remark or a bit of behaviour is OTT, it goes much too far — so extreme that it looks silly, or even rude. A tiny mistake met with a huge scream; a thank-you gift that costs more than the friendship; makeup piled on until the face disappears — those can all be OTT. Friends use it as a light scolding: “That’s a bit OTT.” It is casual talk, not for a school essay. The letters are just the first letters of over the top; say each letter, or say the whole phrase. This entry is that “too much” sense, not a city name and not a kind of TV.