Shit Vapors 

Shit Vapors may be used simply as another name for passing gas, having the farts, breaking wind.

Shit Vapors may also be used to describe the rancid stench left behind in a rest room by someone that took a nasty shit.

Example 1: Dude, beware. I ate at Taco Bell last night. I am cranking out some serious Shit Vapors today.

Example 2: Dude, watch out. Don't go in the rest room over there. Someone had a nasty assplosion an hour ago in there and the Shit Vapors are still lingering. I was holding my breath the whole time I was in there.

Shit Vapors by Eaton Holgoode July 2, 2009

SVD-shit vapor density 

The percentage of stench/stank that fills the air in a confined space (such as a public or private restroom) after releasing feces.

- "damn honey, I'm sorry for taking so long in there."

- "holy crap! I can barely breathe! That must have an SVD of 9!"

-"SVD?"

- " yea... SVD-shit vapor density! You can cut through that with a knife it's so thick!"

SVD-shit vapor density by Sneakyneeks September 5, 2013