Shwhaddup 

Shwhaddup (pronounced Shh-wad-up) is a slang term for Hello or Whats up.

It originated at Los Gatos high school in Los Gatos, California.

Nick: "Sup Mike"
Mike: "shwhaddup!"

Shwhaddup by The Masked Hero July 28, 2010

shaddup 

An even coarser variation of the already popular troubled youth phrase "Shut up!"

"Excuse me, sir, but I missed the trolley. Could you be so kind as to take me to the town square in your horseless carriage?" "Shaddup!"

shaddup by Chris December 21, 2003

shaddup 

Slang form of "shut up," (shut your pie/beef hole, plug it, quit yer damn jabbering, etc.) for those who haven't the time to articulate the entire phrase.

Also similar is Shutcherface.

"Shaddup down there, can't ya see I'm try'n'a sleep?"

shaddup by kraftdinnerclone May 21, 2004

Shaddup shaddup! 

An Australian slang term, used to express a strong fondness for someone's body. Typically used when oogling.

*Female Japanese tourist wanders into a redneck Australian bar*
Jap. Female: Ah! Konichiwa!

Aus. Male: Oh, shaddup shaddup!

Shaddup shaddup! by South East Queenslander May 18, 2018