extranger
Someone who used to be a stranger, but you know now. (An ex-stranger) Also can be used to refer to a fan of indie rock band, The Extrangers.
I met Jay at Guitar Center and now we’re extrangers!
extranger
Treating an ex like a stranger after a breakup
I ran into my ex yesterday and she acted like she didn't know me. Looks like i'm an extranger to her
extrange
Whenever your university offers an extra semester abroad (aka exchange) but it's complimentary to your degree — i.e., you don’t need it to graduate.
I finished my BA degree this summer but my school offers an extrange, so I'll study an extra semester abroad! Isn't it cool?!
Extrange
When you finish school and decide to take another semester abroad, for free...
Bro I wanted to finish my minor, but also wanted to switch schools, so I decided to do extrange