When one possesses negative knowledge
Mr. Jason Brown ain't got a lick
she pinkie promised a guy that he would come pick her up and blocked him when she got home, she ain't shit.
When you are talking about a shallow dip of interest in a particular subject or preference for dating.
Jon: "Why you be skipping all them fine white chicks?"
Kevin: "Some of them are fine but you're tripping if you think they all are."
Jon: "What, that why you always sticking with colored women?"
Kevin: "I may like the occasional white chick; I may pan the river but I ain't opening a mine."
I ain't fucking reading of all that
guy; makes a whole ass paragraph
me; I AIN'T FUCKING READIN' ALL THAT