What's on your mug?

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.

By Didda Tinkle

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"

By D. Ferrel

a silent fart that smells

silent but deadly

By big Zebop

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.

By King Shit

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

easy elevator clearance...

By Greg