Everybody's drowning cause they can't sale

from XV – Farewell Lyrics on Rap Genius

Meaning

He’s talking about other artist who think they’re good rappers but they’re sells aren’t going well.

He plays on the homonyms sale/sell
-sale guide your boat and help control the ship. If you don’t have these your most likely to drowned.
-sell as in opposite of buy.

Drowning=Failure

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