Rap rush, you'll notice the lad crush

from El-P – The Full Retard Lyrics on Rap Genius

Meaning

This song is a sort of rap rush, where he’s spitting as many syllables as fast as possible, and is crushing it.

From an interview with The Skinny:

[“The Full Retard”] was also on some ‘I’m back, motherfuckers’ shit. I just wanted people to know I’m coming out swinging.

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