I remember back when I was living in a freezer
Had to keep my hustle up, so I can keep the heat up

from B.o.B (Ft. OneRepublic) – Good Life(Remix) Lyrics on Rap Genius

Meaning

He remembers living back in an old, cold apartment building or small house, and he had to go be a trapper to get the money needed to pay for the lights and heat

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