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

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

SHADAFUQUP 

'shut the fuck up', but intensely bold and cutely concise.

Person 1: 0migawd pls do NAWT tell him dat ; r0fl lmfAO lolzsss xPPP

Person 2: SHADAFUQUP

SHADAFUQUP by woopsey July 30, 2013

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