When you check in on foursquare to a place whose mayor is your friend, your check-in message is "Your friend X is the mayor here (and you're creeping on their turf)."
What does this expression mean?
EDIT:
In foursquare's game mechanics, the person with most checkins (in different days) to a venue is the venue's mayor. So, when you check in somewhere you're actually getting yourself close to steal that person's mayorship.
I understand that the word "turf" here has to be a slang for territory; my main doubt is about the word "creeping," then. Does the sentence means "you're on your way to steal your friend's mayorship" or "you're enjoying the benefits of hanging out on a place that is commanded by your friend"?
Best Answer
I cannot account for any peculiarities in foursquare's behavior, but "creeping on one's turf" means something similar to "invading their territory." Typically, one's turf is akin to their:
Etymonline has this to say of turf:
Creep, in this case, would mean that you are approaching the turf in a manner that could be deemed a threat or an attempted takeover. This, naturally, could be exactly what was intended. From my local dictionary:
With regards to turf and the corresponding turf wars, creeping would be trying to sneak in and suddenly swipe the territory away.