Yeah, we spit that saliva,

from Childish Gambino – V. 3005 Lyrics on Rap Genius

Meaning

Going off the last line “the flow is so lava”

A common verb in rap is “spit” or “spitting” which essentially means you are rapping.

Childish draws the connection from the slang verb, to the actual action of spitting. Saliva is what is in spit.

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