And look at that, your bird friend's dropping words absurd again
Useless bits of rhymes that expose the nerd in him

from Childish Gambino (Ft. Regular Show & Tyler The Creator) – Regular Show "Rap It Up" Lyrics on Rap Genius

Meaning

What Alpha Dog (Donald Glover) is saying is Mordecai is using words way out of his league and is still a bad rhymer

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