I'm the bestest, on a bad day I spit asbestos

from Earl Sweatshirt – Molliwopped Lyrics on Rap Genius

Meaning

Hidden in the sound of the word asbestos is a playful “As best is.” Asbestos is in fact often used as building or electrical insulation because of its sound absorption, tensile strength and resistance to heat, electrical and chemical damage. The implication is that Earl’s spitting rhymes that are bad for your health.

Wordplay here as well: When broken down, “Asbestos” contains “As best.” Earl spits as the best.

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