Still being checked into a location via foursquare, Yelp!, FB, etc. after you've already gone to another location without checking in there, causing friends who show up expecting you where you're still checked in disappointed.
Romulus: We totally tipped the chariot to get to the Forum, and Augustus is already fourgone.
Remus: It's just common courtesy to check out. Bastard. Let's head to the Coliseum instead. Says Octavio is checked in there.
Romulus: Unless he's already fourgone, too.