Three emotions, put into words, following eachother in quick succesion. Blunt Amazement, "Oh my God." Slight Amusement, "Laughing out loud." followed by Blank Confusion/Crude Amazement, "What the fuck?"
You are playing some sort of counter-strike like game. A friend of yours, or just someone you know, leaps over someone else's head(omg), looks down(lol), and plants a killing shot in his face(wtf?).
Oh my god laughing out loud what the fuck barbecue.
OMGLOLWTFBBQ is composed of 4 abbreviations (OMG, LOL, WTF, and BBQ) and was originally used to make fun of people who used abbreviations online a lot. It can carry the meaning of any or all of the constituent abbreviations.