a) A giant wave generated by an undersea earthquake, landslide or by a meteor impact.
b) Splashing of water in the toilet caused by plopping a big turd.
I plopped a huge one and the tsunami it caused splashed my ass all over
by Hugh G Rection September 20, 2003
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A tsunami is a bathroom prank that can be performed as follows:
1. Wait for one of your buddies to use a public bathroom stall.
2. Fill up a couple of buckets of water and gather outside the bathroom with other willing participants.
3. Walk into the bathroom and shut off the lights.
4. Get your helpers to start banging on the walls of the stall while yelling, "TSUNAMI," at the top of their lungs.
5. Dump the water on your soon to be ex-buddy.
6. Run away. It'll be a few minutes before he finishes up and starts looking for you.
We gave Brett a tsunami last night! He was pissed!
by The BFD May 31, 2008
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In Ohio, it means you are about to get it in, in Japan, it means your shit just got fucked up.
Molly Jordan is about to try to tsunami Owen Dorsey, unless he calls a Japan
by O-Dorsey March 19, 2011
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When a day trade turns into a position trade
Guys I'm going long here with a tight stop day trade set up but might limit profit taking today as this catalyst could turn it into a potential Tsunami
by Waves 618 February 21, 2019
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when an asian girl squirts pussy juice while reaching climax during intercourse
Chris: Yo Jose? whats that stain on your shoes?

Jose: Damn yo!!! Probably from Sook Ling's tsunami last night!!!Imma get more DIM SUM TONIGHT BOY!!!!
by josaids November 2, 2009
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When you piss everywhere in a bathroom
"Man, we that bathroom was hit by a triple tsunami, the walls and floors were full of piss!"

"Let's go tsunami"
by Brian February 20, 2005
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