silent but deadly


Also found in: Acronyms.

silent but deadly

1. adjective, slang Of an instance of flatulence, making no sound but having an extremely offensive odor. For some reason my farts are always silent but deadly.
2. noun, slang An instance of such flatulence. Someone let out a silent but deadly! Quick, open a window! OK, who's responsible for that silent but deadly?
See also: but, deadly, silent

silent but deadly

and SBD
mod. [pertaining to a release of intestinal gas] soundless but smelling horribly. Who floated that SBD air biscuit?
See also: but, deadly, silent