His baseball cap perched on his head at a strange angle was an oblique cultural reference
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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