(Choom chigga choom choom choom choom waa)
Guess who, what’s happenin' guy?

from Bad Meets Evil (Ft. Slaughterhouse) – Loud Noises Lyrics on Rap Genius

Meaning

Eminem is asking everybody to guess who’s back, and follows it up by asking what’s happening since he left. Ironically, he asks it in a Cartman type of voice, who he referenced himself as back on his track “Marshall Mathers”

So he gives you a hint as to who’s back. The 26 year old skinny Cartman (although he’s much older now), aka Marshall Mathers.

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