I'm the man, you need me I'll be on the fifth flo'
Just chillin

from Common – Watermelon Lyrics on Rap Genius

Meaning

This is a reference to the recurring character Bruh Man from the TV show “Martin”. His catchphrases were “fif flo'” and “nuttin, jus' chillin'”.
http://www.youtube.com/watch?v=Yne4xKQtJic

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