Dont really know, rappers use a little bit crazy language, its something like a graffiti, only the one who makes it knows what its all about.
Stop! This microphone is a glock! Esende, have!
Esende, I have!
'Mam' regards to the first person only so you dont really need to add JA ( I ). but of course both forms are correct - Mam Glocka, Ja mam Glocka.
same with 'this is'. You can say 'to jest glock' but it's the same as 'to glock'.