Your little baby bone boy killin' me
Swearing he’s grown when he got that steel
But he ain't swim with that blue whale

from Frank Ocean – Blue Whale Lyrics on Rap Genius

Frank likens the youth hood with a gun (“steel”) to a pirate (“baby bone boy” — referencing the skull and crossbones)

The boy thinks he’s a man since he has a gun, but he is unfamiliar with the vicissitudes of life — symbolically compared to swimming in the ocean

Furthermore, Frank is suggesting that if the boy swam with the blue whale — the largest animal ever to have existed — he would put his existence in context, and understand how truly young he is. The whale works similar to staring at the stars or a majestic natural feature — invoking awe in the insignificance of one’s existence

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