ex-door neighbour 

Someone who used to live next door to you; either they moved away or you moved away

Guy 1: Who is Josh going on a date with?
Guy 2: Girl named Olivia.
Guy 1: How does he know her?
Guy 2: She is his ex-door neighbour.

ex-door neighbour by Big Sig & Bad News Brookes July 9, 2010

Ex-door Neighbor 

The person who used to be, but is no longer your next door neighbor.

I invited my ex-door neighbor from California; I hope you don't mind.

Ex-door Neighbor by Jeul December 30, 2008

ex-door neighbor 

Someone you know who used to live right next to you.

Tim (to Alex): What's up?
Tom (to Tim): Do you even know that dude?
Tim (to Tom): Heck yes, he's my ex-door neighbor, we used to hang out sometimes.

ex-door neighbor by John319 August 26, 2007

Ex-Door Neighbor 

The person who used to live next door to you, but no longer does, either because they moved away or you did.

Susie just moved away, I guess that makes her my ex-door neighbor.

Ex-Door Neighbor by Zekk1331 October 3, 2011