means to spill someones secrets aloud; to put someone on blast; to tell everyone in the vicinity what someone is trying to sneak and do
Classroom full of people,
Earl: (whispering) Man I got so high last night!
Tyrone: (talking really loud) Whaaat, You got high last night, man why you didn't call me?
Earl: Man why you gotta be loud cappin me like that?
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Speaking on some ones name like they bout it or talking too loud.
Him: MARCUS AINT GONE PUT A HAND ON ME!
Her: He always loud cappin.