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Short for Diarrhea. It starts with a D, ends in the bathroom, and is never heard in polite conversation.
Sorry Professor, but I've been stricken with Silent D. Unless you can move that engine into the bathroom, I don't think I can run those tests you wanted today.
slang term used in parts of North Carolina to describe someone who is ballin 24/7

(ballin - (adj) - the act of being fly)
(random homeless korean) - "That guy is a dumbass!"
(random pot farmer) - "no, that guy is Silent D"

Silent D by Evil_Jesus April 3, 2008

silent d fly

silent d fly,usaly a other name given to a very good player on a mmorpg.thease are NOT geeks or nerds.
silent d fly means a very good player on computer games
silent d fly by th3 w01f April 26, 2006

silent duck 

The shape the hand makes while fisting.
Dude, your mom is soo freaky she begged for the silent duck and now my watch is missing
silent duck by Super Flynn December 27, 2007

The Silent Duck 

1: The Silent Duck

- The shape a hand tends to employ to participate in the act of fisting at the point of entry, this later branches out into the full fist.

2: To Silent Duck:

- To threaten an enemy with the Silent Duck shape, they will then know that you definately mean business and will desist immediately.

1.
Joyce - "That dude fully attempted to use The Silent Duck on me last night, I wasn't having any of it with my monster cunt!"
Barbara - "You go girl."

2.
Dave - "Sup chaps"
Jack - *SILENT DUCK*
Dave - "Okay guys I know where my place is..."

The Silent Duck by Dr. M. Edal December 4, 2007

silent disco 

a surreal party experience where (usually due to noise curfews) the music is pumped through distributed wireless headphones instead of the speakers. a crazy sight to behold, even crazier to partake in.
bonnaroo's silent disco was baller fun-even for the people who gathered round to watch us whilin out to the music only we could hear
silent disco by senor frog February 14, 2006