I don't know why or how it started but lately when I want to express some sort of intense emotion in a trivial manner, I will say O-M-G.
Each letter is spoken emphatically. OH *pause* EHM *pause* GEE
When someone tells me a piece of interesting news. O-M-G.
I just turned 29 and I'm talking like a tween. Like, O-M-G!