A white tsunami is a when you throw a bucket of cum on the back of a girl as you climax. The action is usually accompanied with a loud COWA BUNGA DUDE! The girl then rides out the wave. Bonus points if she still has her sandals on.
Dude, it took me 2 weeks to fill up that bucket, but it was totally worth it to let loose a white tsunami on Andrea.
by LulzBrah June 15, 2011