A fork of Rural Dictionary
His baseball cap perched on his head at a strange angle was an oblique cultural 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