Cut your fucking head off and ask you where you're headed off to
Get it? Headed off to?

from Eminem – Underground Lyrics on Rap Genius

Meaning

Word play which shady is so proud of he points it out for you. He has cut your head off and then asked the decapitated head where its head(ed) off to. You might see Shady pick your severed head up and even hear the question perhaps but you won’t able to reply without vocal chords.

This line is also a reference to the classic line from his track “Criminal”, where he says: “Hey, it’s me, Versace! Whops, somebody shot me, and I was just checking a mail…get it? Checking a male?”. “Criminal” is the last track of the “Marshall Mathers LP” album, just as “Underground” is on “Relapse”.

I’ll be heading off now.

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