Niggas spit heat, propane
from Tyler The Creator – Jack and the Beanstalk Lyrics on Rap Genius
Meaning
Propane is one of several gasses that fuels welder’s torches:

The temperature of the flame can reach 4,530 °F (really fucking hot), like Tyler’s rhymes
Cocaine is also cooked over a stove, connecting to the first part of the line
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