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1. 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".
2. shaddafuckup
A one-word way to tell someone to "shut the fuck up"; especially when used by an asian.
Shaddafuckup and go to sreep!
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