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"
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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.
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when your fart is silent but smells like complete shit - maria yacovelli
Ooh that one was 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!
1.n. A classic old school horror movie about a killer dressed as santa claus.
1. Lizloo and I are going to get some popcorn and watch silent night deadly night...then fuck.
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A gap in which you have to silently masterbation while in the same room as someone else without getting caught
Person A "hey what were you up to last night?"
Person B "I was doing the silent but deadly fap challenge, how about you?"
A fart that is silent but it smells very bad.
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Silent but deadly asf