shaddafuckup 

This is the reply one should use when some idiot attempts to tell you how you should do something you already deal with on a regular basis and that they have never experianced and know nothing about.

Mr. Knowitall was once again getting on everyones nerves by telling them how they should complete the job when one individual shut him up by blurting out, "shaddafuckup".

shaddafuckup by jpg3 May 11, 2011

shaddafuckup 

A one-word way to tell someone to "shut the fuck up"; especially when used by an asian.

Shaddafuckup and go to sreep!

shaddafuckup by Jamaletamale March 26, 2008

shutdafuckup 

To "Shut the fuck up"; cease blabbering

Bitch, shutdafuckup and suck my cock.

shutdafuckup by bah June 19, 2003

shuddafuckup

A phrase that has been shortened to two syllables, meaning shut the fuck up mainly used to annoy friends by saying it non-stop whenever they try to talk.

Amanda: Hey, guess what I did today, I went -
Alex: shuddafuckup.
Amanda: you shuddafuck up!

shuddafuckup by Amanda Is Cool January 18, 2009

Shaddafuqup 

A word used to more effectively tell others to be quiet. This word is most often used when that one friend will not stop talking, or when one just needs peace and quiet. Optimal results are when you scream this word in the midst of a quiet conversation.

Friend: ...And then after we went to the mall we went to the pizza store, which in spanish is called a pizzaria, and while we were there-

You: SHADDAFUQUP

Shaddafuqup by Joninja January 21, 2013

shuddafuckupyoufuckenretarded 

to show someone how stupid he is.
aspecially like matthazan

shuddafuckupmatthazanyoufuckenretarded!
this houldnt take you more than 2seconds to say!

shuddafuckupyoufuckenretarded by zi zi wang April 16, 2005