They light a fire under my ass nigga my shit hot
Even if you squatted under volcanoes niggas your shit not

from J. Cole – Water Break (Interlude) Lyrics on Rap Genius

Meaning

Cole is sayin dhat his rhymes (shit) are hot like dey lit a fire under his ass. and even if you sit on a volcano, which is hotter than a fire, your ‘shit’ still wont be hot

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