Like a broke stock broker and a sidewalk
Y'all niggas ain't fly as me
That's why I defy physics and y'all niggas collidin, peace

from Lupe Fiasco – Champ Is Here (Freestyle) Lyrics on Rap Genius

Meaning

If you listen to the song you hear a man jumping off a building committing suicide. This is a reference to the Great Depression in which broke stock brokers jumped off of buildings after they lost everything

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