Everything on the line when I'm rhymin
The only way I pay rent, I represent
The only way I eat, I rhyme to a beat
The only way I buy clothes, I rock shows
Now you can see why the problem is posed

from Fatlip – Writer's Block Lyrics on Rap Genius

Meaning

Rap is his main source of income he can’t live his life comfortably without it. Maybe of the reason why he re united with The Pharcyde for their 20th year anniversary.

At 0:17 He talks about how he thought about retiring everydya but has nothing else to do except RAP. “I Might as well hold a sign up that says will rap for food"
http://www.youtube.com/watch?v=pxxXS0O5e98

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