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1.
Hello, but in a preppy sort of way
Airhead prep: Omigosh Hi!
Me: Uhh, you're annoying (gets up and walks away)
by Grant July 17, 2003
 
2.
A dramatic form of hello, usually a pause after "Ohmigosh" for emphasis.
She walked to the table and said, "Ohmigosh... hi".
by Sara February 03, 2003