It's called Omigod You Guys, from Legally Blonde: The Musical. Long story about how I even found out about this...
"Omigod, omigod, you guys!"
And my favorite part, the ending...
"Omigod... Omigod... Omigod... Omigod... OMIGOD... You guuuuUUUUuuuuuUUUUUUuuuuUUUUUys! Omigod!"
No, I'm serious. I thought my music teacher was just pulling a prank when he kept insisting it was an actual song...
And then, (now that I've looked up the plot on wiki for this purpose) the REASON they're shouting "Omigod, omigod, you guys!" breaks up with the Mary-Sue-to-the-extreme MC one song after, giving her an "excuse" to mope and sulk for 12 days straight.
Omigod, omigod you guys, I just, like, lost all faith in humanity whatsoever you guuuuys.
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