"Stop messing with me or I will get Shimmy Sham on you".
When you had nothing to do over the weekend:
"Shimmy Sham and I were hanging out"
When you want to avoid doing something or going out with somebody:
"Sorry I can't make it, I got plans, me and Shimmy Sham are going to pickup 2 chicks downtown".
When you want people to think you are crazy or have a vivid imagination, end all your sentences with: "Ain't that right, Shimmy Sham?". For example: "Kanye West is a punk! Ain't that right Shimmy Sham"? (Beware: If Shimmy Sham answers you back, seek medical attention).
Orignially coined by a popular player named Zio Carmine in a MMO game played by millions (iMobsters). It is now being used in games to let opponents know that their death or their demise in the game context is quickly approaching and that such defeat will be their end!
Zio Carmine: I'm just going to have to go nut and Shimmy Sham his ass until he is so dead his ashes can be scattered at the graveyard along with all the other dead people.