"Acceptably appropriate" version of "Jesus Christ and God Almighty". Often used by those who are used to being among polite company (and are kind of a nerd).
6-year-old in tux: *stubs toe* "Cheese and crackers got all muddy!"
Used when there is a word which someone thinks you're not old enough to hear, even though you are. Geez.
You're such a (beeeeeep!), I can't believe you.