The impolite way of asking a black person to be repeat themselves. May also be taken as a friendly gesture.
Harry: I fucked Helga last night after beatwalking then I gave her a bubble beard she had mad squeamy gash.
Tom: You're a bear stuffer. That'd give me mad insta flop.
Harry: NIGGA SAY WHAT
I heard you fucked kelly nigga." Bitch, say what? All hell no, you think i would hit that nasty ass shit. You know everyone on the block hit that shit already, I'm good!
Modern version of the grandparents' phrase "I beg your pardon." Wordsbetter when talking to friends, but not so much when talking to teachers or bosses.
1: You wanna go hang later?
2: Say what???
1: I said you wanna go hang later?
2: You know it!