"Oh my stinking hell/heck"
Something teenage girls or guys with no life seem to really enjoy saying. Usually only heard by people who think they're cool, but are really not. This is very popular on MySpace, FaceBook, online games, or other things like that.
Comment on YouTube: "OMSH, that vid was so cool!"
Reply comment: "Are you a 13yr old girl?"
Kid on WoW: "OMSH, I just killed some Alliance guy who was 7 lvl's higher than me! I'm so 1337"
Guy on WoW: "Wow, you should just log and never come back."