That feeling you get when you know somebody who uses the phrase "Oh my god" in every sentence.
Cindy:- "OMG we ran outta milkshake? OMG this is the worst day ever!"
Cindy:- "OMG somebody assassinated the president? OMG thats so horrible!"
Fred: "Hey dave, you've known Cindy for a long time, does she always use OMG in every sentence?"
Dave: "Yep, her first words were OMG, i get constant De ja OMG around her"