couple-culture reference

When someone brings up a previous entry in that personal, tiny subculture of jokes, observations, awesome one-liners and general ideas that is borne of any two people. Such cultures can be linked by more than two people but are not nearly as intimate.

proper couple-culture reference

A: Hey B, x?
B: Haha, x! Good times.

improper couple-culture reference

C: GUYS
B+A: yes?
C: x x x x x x x
B+A: lol