Tsunami is a single A trick that has been in the world yo-yo contest compulsories list for a number of years.
- Throw a breakaway sleeper.
- Do an undermount over your freehand index finger.
- Swing the yo-yo over so the undermount is over on your throwhand index.
- Swing it back over to your freehand index.
- Do this as many times as you want and then catch the yo-yo.