silent but deadly 

When a fart can be emitted so silently yet its strong enough to floor a rhino.

Eating a Meat-Lovers pizza gives you silent-but-deadly ass-gas.

silent but deadly by Didda Tinkle May 24, 2004

Silent but deadly 

A creeper, a floating air bisquit. A fart that can not be heard but can sure as hell be smelt. This type of flatulent sneaks up on you and unless there is a breeze, hard to tell who it came from. Don't ever recognize this type of fart out loud otherwise you fall into the rule of: "Whoever smelt it delt it"

"Dayum, someone done let loose a silent but deadly"

Silent but deadly by D. Ferrel September 29, 2003

silent but deadly 

a silent fart that smells

silent but deadly

silent but deadly by big Zebop November 13, 2020

Silent but deadly 

A fart that is not heard, but smells so horrid that it could kill; also: Silent but violent, SBD

Your farts aren't that bad when compared to Grandpappie's ol' silent but deadlies.

Silent but deadly by King Shit January 16, 2003

silent but deadly 

something that, when combined with a dutch oven maneouver, is an excessive use of deadly force.

easy elevator clearance...

silent but deadly by Greg April 29, 2004

Silent but Deadly 

when your fart is silent but smells like complete shit - maria yacovelli

Ooh that one was silent but deadly .

Silent but Deadly by Sara lobsterface July 11, 2017

Silent but Deadly 

When you thought you ripped a good one, but it ended up being silent, and smelled terrible.

Person 1: *Farts Silently*
Person 2: Do smell that?
Person 3: Eww! Person 1 ripped a Silent but Deadly!

Silent but Deadly by AFZFilms November 17, 2018