A ship or pairing that not many people ship or is very rare to find fanfiction and fanart of. Typically happens within small fandoms or with minor characters.
I ship See-More and Billy Numerous from Teen Titans but it's such a rarepair.
I like to think that everyone has at least one rarepair.
When a somewhat (or extremely) disgruntled retail store employee takes out their work rage on the intercom, typically really loud and sometimes ear piercing. Usually someone who has been working there for a while with a nasty attitude.
"Hey, did you hear Melissa's ragepage over the intercom? I think she scared that customer in aisle 14..."