There are lots, but "I know, right?" is at the top of the list right now, even though >I< say it. Also, totes (as in totally), Preesh (as in I appreciate it) and Dude.
What had happened was.
"cool beans" yikes!! that's one of the worst..
Can I ask you a question?
Apparently. You just did!
You know what i'm sayin?