If it can't quench my thirst what you in my fridge for?

from The Notorious B.I.G. – Biggie Smalls Pepsi Freestyle Lyrics on Rap Genius

Meaning

Biggie only keeps drinks in his fridge, and since Pepsi’s a drink, it hydrates him. However, as it contains caffeine it has a mild diuretic effect which makes you pee more, which may lead to you feeling more dehydrated in the long run

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