But I'm ghost before you can even say boo hun, let alone call me one

from Bad Meets Evil – A Kiss Lyrics on Rap Genius

Meaning

Since he won’t wait around for a relationship he’s gone like a ghost before the chick can even address him as “boo” which is a typical nickname couples use in relationships.

Has nothing to do with video game characters. Ghosts said boo before Pac Man came out. And “I’m ghost” is a common phrase for vanishing or leaving in rap.

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