Trying to catch his microphone, check 2-1-2

from Lupe Fiasco (Ft. Matthew Santos) – Superstar Lyrics on Rap Genius

Meaning

Most obviously a mic check, (“is this thing on?”)

But 212 is also the area code in New York where he was booed during a concert early in his career.

Additionally, there’s a double-entendre — he’s trying to “cash his microphone check,” as in he’s trying to get his payday.

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