1. To be extraordinary. This phrase is most often applied to enjoyable things (especially food), but it can describe unpleasant ones as well. If you're having dinner at Janine's, then you're in for a real treat—her cooking is out of this world! That car service's exorbitant rates are out of this world. Can't we just take a taxi?

2. To be intoxicated. Do you remember last night at the bar at all? You were really out of this world! I'm not sure what I took, but I was definitely out of this world at the concert.