A dolphin gon shake his fin, regardless if he gets in
Or out of water, most important thing for him is to swim
And Flipper didn’t hold his nose, so why shall I hold my tongue?
Some things are just natural; like a dolphin flapping his fins. Andre compares the dolphin to the hustler from the previous line: a dolphin will shake his fin (do what he has to do), regardless if he gets in (legal means) or out of water (illegal means such as selling drugs) most important thing for him is to swim (moves forward in life and prosper).
So like Flipper, the famous dolphin who could communicate with humans via is nose — Andre has to spit rhymes — natually.
Basically, a dolphin will swim no matter what and a hustler will hustle — legally or illegally. Similar to how dolphins have to come up for air, a hustler can’t hold his tongue and has to come up and speak about why he does what he does.
In terms of the dolphin comparison, Andre is basically saying that nothing is wrong with the boy’s aim, he just has to change the target. He needs money so he will flap his fins regardless of if he is in the water. The “in” refers to making money the right way.
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