What is onyx? (Biggie Smalls lyric)?

In Can I Get Witcha, Biggie says "All I wanna do is smoke a little chronic. slam ya like onyx. and get ya hooked on this biggie smalls phonics. 102..." i don't know what these lyrics mean? (Also for the onyx part, I looked up onyx and it's a kind of rock? I still don't get it)