Attaboy, you're kindergarten repeating
from Wax – RED Lyrics on Rap Genius
Meaning
Continuing the “left back” idea, Wax sarcastically gives an “attaboy,” which is usually reserved for doing something actually impressive or spectacular, to someone whose actions are equal to repeating kindergarten… which is sort of embarrassing (Could you not color in the lines or something?).
Wax is making moves and these other cats are stuck doing the same things: making shitty music in their bedroom closet and NOT doing shows and traveling.

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