But he just a fake nigga who blog in all caps

from Childish Gambino – Heartbeat Lyrics on Rap Genius

Meaning

Her new guy is a joke. He thinks he is cool though because he blogs in all caps. (This is a common technique to make you look cool or smart through emphasizing things. IT NEVER WAS COOL THOUGH!).

This could be making fun of Kanye West, who was known for writing long blog posts entirely in CAPS.

More likely this is a reference to Tumblr (of which CG’s a fan), where there is a lot of OVEREMOTIONAL CAPS LOCK TYPING

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