And you know we don't give a fuck it's not your birthday

from 50 Cent – In Da Club Lyrics on Rap Genius

Meaning

You might be thinking, “but 50 just said it was her birthday! I’m confused: maybe it’s February 28th and she’s a leap-year baby?” This is because “it’s your birthday” also means “it’s your lucky day”.

It can also mean that he doesn’t give a fuck if he mistook the day for shorty’s birthday because he just wants to party all day, everyday!

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