I'll add on as I think of more
  1. you're a peach
    my absolute favorite
  2. what's up buttercup
  3. make like a banana and split
  4. uh oh spaghetti o's
    not that old but it's always adorable when little children say it
  5. that's rad
    any use of the word rad/radical is just a great idea
  6. zonk out
    a hip and trendy way to say you fell asleep!
  7. deuces
    Mikey don't you dare criticize me