cloudy river 

Noun - A prank, or sex act, in which a party of 25+ men ejaculate into a large bucket or basin. Their semen is then diluted with water. The cloudy semen-water is then poured slowly onto another individual without their knowledge.

1. Steve passed out so we gave him a cloudy river.
2. That slut swallowed the cloudy river

cloudy river by Fapstick Jenkins March 31, 2015

Reverse Cloud Effect 

Of Canadian origin; when betting on a particular sport team and or athlete to win and you actually win because your one friend forgot to get in his bet or
Chose not to bet that day;

I won my bet this weeekend because my buddy didn’t get his bet in- total reverse cloud effect- thanks!

Reverse Cloud Effect by Homeboy363 August 5, 2018

reverse mushroom cloud 

The act of evacuating one's bowels so quickly and violently that the debris forms a mushroon cloud in the toilet.

We ate at that new mexican restaurant and when I came home I dropped a reverse mushroom cloud in the toilet.

reverse mushroom cloud by mikeyhonda January 16, 2005