Friday, friday, party like its your birthday

from Tyga (Ft. Future) – Show You Lyrics on Rap Genius

Meaning

Usually people have a big party with every necessarily on their birthday and this friday Tyga’s having a big party and he is stingy.
And you know what that means…

Also a reference to 50 Cent’s classic In Da Club:

We gonna party like it’s your birthday

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