This is a South African
slang word, which probably originated somewhere in
the South of Johannesburg, that describes something which is expensive,
fancy and yuppy.
It can also be used to describe a very rich person living in the more affluent parts of Johannesburg, especially the Northern parts of the city.
Peter: Hey Sipho, where do you work?
Sipho: In the north of Joburg
Peter:
Gee with all the larnies, huh?
OR
John: Damn, look at that Rolls-Royce Phantom, what a car!
Piet: Yeah, very larney indeed!