Slow mo, when the tempo slows up and creates that new, new
He seems alive, though he is feelin blue

from Kid Cudi – Day 'n' Nite (Nightmare) Lyrics on Rap Genius

Meaning

Predictably, the beat livens up a little here, He seems alive, though hes feeling blue, is refereeing to the next live, because although he seems happy, hes a sad. If you ever Cudi in his videos he looks half alive, and down; also the sun is shinning man hes super cool, is suggesting that although he has a decent amount of riches, hes still cold deep down inside.

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