A term used in Karate

or

A popular rhythm game.
1. Fighter 1: Are you ready to fight?
Fighter 2: Osu!
2. Tom: What are you doing Simon?
Simon: Playing a game. It's called osu. Wanna try it?
by 123adi May 13, 2016
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osu! is a freeware rhythm game originally for Microsoft Windows. It is written in C# on the .NET Framework. The game has also been ported to Mac OS X, iOS, and Android. Its gameplay is based on commercial titles including Osu! Tatakae! Ouendan, Elite Beat Agents, Taiko no Tatsujin, beatmania IIDX, O2Jam, and DJMax.

Despite the stupidity stupidity of some; it is pronounced Oh-Sue. Not OOS.
A: Have you heard that game, osu?

M: Yeah it's like guitar hero except you pick the songs.

A: Wow sounds cool. How do I say it?

M: Oh-Sue.
by Oh-Sue September 6, 2014
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(usually pronounced: oos )

A term used in karate or mixed martial arts schools meaning yes, hello, goodbye, and I understand. A general affirmative.
Teacher: Is everybody ready?
Students: Osu!
Teacher: Begin!
by Guildenstern14 November 13, 2009
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A rhythm game by Dean Herbert where you click circles. It's also a game for problematic people and Anime Weaboos
Osu has not only wasted my brain cells, but it also caused me to have an addiction to anime and no friends. I can no longer call myself a normie.
by WebooTrash April 6, 2019
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Osu: a better guitar hero but with a piano and clicking also good when there a Domestic Dispute (DD) between your mom and dad and your too lazy to call the cops nor wait to enact Plan GN-PF since PW-hub or Paperwork hub isn't fun to do for an Incident report for a Dispute over Toilet paper
Yea I played Osu! while my parents were fighting since I didn't want to make an Incident report for enaction my policia federal/Guardia Nacional ( federal police / national guard) plan
by Hk416 March 3, 2021
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OSU! is an open source music rhythm game developed by Dean Herbert at 2007. The game consists of four game modes: osu!standard, a circle clicking simulator; osu!taiko, a drumming emulator; osu!catch, a fruit salad catcher; and osu!mania, a key smashing synthesizer. For more info, you can visit: osu.ppy.sh
I heard that OSU! has become more and more popular.
by Jin6000 March 18, 2019
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