In the back of the bush, like Gavin Rossdale's drummer

from Childish Gambino – Freaks and Geeks Lyrics on Rap Genius

Meaning

Rosedale is the lead singer of the band Bush. Traditionally in concert, the drummer is in the back. So back of the Bush

Literally, however, Gambino’s large genitalia is hitting the Bottom of the Pussy Hole

See him peeking out the back there?

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