Blow-by 

The foul smell of a fart that has gained momentum by passing by a turd before exiting the rectum. Usually accompanied by a prairie dog. Scent is thick, heavy, and smells like shit, rather than gas.

Ashleigh, is that blow-by I smell?

Blow-by by Dr. Duty September 5, 2012

Blow-by 

When you fart past a shit & it gathers shit molecules on the way out.

Go take a shit instead of making us smell your nasty blow-by.

Blow-by by Rev Sharpton December 28, 2021

blow-by 

A condition exhibited by a worn-out internal combustion engine when the piston rings no longer efficiently seal the combustion chamber, allowing compressed air and fuel to escape the cylinder and thus power is lost and emissions are increased. The engine also usually burns oil.

I was going to buy that 350 from Carl, but it had too much blow-by and needed to be rebuilt

blow-by by FlYhEaD January 20, 2005

blow-by 

1)Blow-by occurs when the explosion in your engine's combustion chamber causes fuel, air and moisture to be forced past the rings into the crankcase. Your engine's rings must maintain an excellent fit in order to contain the pressure.

2) Blow-by also occurs when somebody who REALLY needs to take a dump lets loose a fart so putrid and heinous, that it smells as if he just crapped his pants.

Daaaaamn Shecky! *cough* Judging from the stain on your trou, that wasn't mere blow-by.

blow-by by sophistiKate September 9, 2011

blow-by 

a blow-by is when a turd is lodged inside your poofactory the actual blow by is when the backpressure blows by the turd.

the pope is a blow-by

blow-by by sheriff woody February 26, 2004

blow-by 

To blow a load and run. AKA drive-by.

I can't believe he pulled a blow-by. I'm never speaking to him again. What a jerk.

blow-by by Jolie St. Laurent April 26, 2006

blow by

Gas that escapes between the wall of the anus and the poop that needs to come out.

Hey Ralph, you smell that! I have to shit so bad I've got blow-by.

blow by by Elvis October 18, 2003