Slang for "Do you you know what I'm talking about?"
Makes more sense if used with a southern drawl
-Aye man wats the name of that movie with the two robots?
-Uh, which one?
-You know the one with the gold british robot and the whistlin garbage can. They be in space in shit and the white dude be throwing motherfuckas around with telekenisis and his dad cut off his hand..nomtoppenbout?
-Uh....S, Star Wars?
-YEEEA! See u kno wat im toppenbout!