I like the phrase "eighty-six," meaning "to stop, end, terminate." (e.g. "Eighty-six playing that John Williams cd so loud or I'm gonna have you tarred and sequinned, yuh little nimrod!!")
Yontu? A slang I use for "Do you want to?" I didn't invent it, obviously, but it's a tongue-in-cheek sendup of how some folks where I live tend to garble their words.
I sometimes use "Nix" or "Ixnay" ("pig latin" for "Nix") - of course, not many folks are familiar with "pig latin" nowadays, it seems.
"Toast" for something that's ruined.
Lots of guys I've known use "Bugger" or "Buggered" for when something mechanical is messed up. Particularly for things like "I cross-threaded that bolt and now it's all buggered up!" I would wonder if they knew the origin of the word.
