I can't really think of too many right now:
Oh my:I forget where the origin of this started..but our huge group of us used to say it a lot only it's more like "oooooooh my"
Unsanitary:Because I don't like things that are dirty
That's the best!: Everything is the best to me
You don't understand: mm..I just say it a lot.
gee-ross: In place of gross
Awe-some: In place of..awesome.