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Pronounced with excessive exaggeration of the second "a", as in example 1. Shaddap is used to tell somebody to shut up without sounding overly serious. It can also be used pre-emptively, as in example 2. The crowning usage of shaddap however is as an unexpected end to a phrase, particularly when used to imply that somebody had said something extremely stupid.
1. "Shaddaaaaaaaaaaaap."

2. "I know what you're going to say, and I'm telling you, shaddap."

3. "How much more does a hard drive weigh when full?"
"Oh it weighs about shaddaaaap."
Shaddap by Innominate February 1, 2008

Shuddahoe 

When someone is talking about something you do not care about, and you hate them with a passion.Some dum ass. You say, SHUDDAHOE.
Bob :Hi, im bob.

Jim :Shuddahoe i dont give a fuck.
Shuddahoe by Very large cock November 9, 2007
An extreme form of human failure, know to be attracted to dave matthews, phish, bruce springsteen, vireo, and o.a.r.. Can have many personalities including spider man and the infamous sloppy joe. Love to walk around in socks and lift weights. Must also love blue. Tend to be gone.
"Wow who calls a Bagle a Bagul?"
"A Shudda."

She is a really controlling person, but she always ends up with Shuddas.
Shudda by Joe Cuff Cayemberg February 4, 2009
what you tell a jerk off to do
Shuddup you stupid prick!
shuddup by gobo June 2, 2003
what Donald Duck says to Goofy Dog.
Goofy: Gawrsh.

Donald: Awh, shuddup you big Palooka!!
shuddup by Victor Van Styn August 14, 2005

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