Know I keep it low-key like a motherfucking midget door

from ASAP MOB (Ft. ASAP Twelvyy & Da$h) – Jay Reed Lyrics on Rap Genius

Meaning

To keep it “low-key” is to keep calm and chill. However, the term is also being used in relation to an actual key in a low position. A key hole on a door for midgets would be really low.

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