Omigosh
How really {girly american girls say omg or oh my god/gosh. Add O's in the beginning to make it even more girly, and combine with even more O's in the word "so" to maximise the whole meaning of it.
Example:
Ashley: Oooomigosh, did you see Josh in class earlier today?
Brittney: Omigosh yes! He was soooooooooooo hot!
Ashley: Oooomigosh, did you see Josh in class earlier today?
Brittney: Omigosh yes! He was soooooooooooo hot!