I'm the cell phone, they the room keys
I'm some shell toes, they some shoe strings
I turn 'em off, I take 'em out

from Lupe Fiasco – BMF ( Building Minds Faster) Lyrics on Rap Genius

Meaning

Lupe lyrically outdoes his opponents, mediocre pop rappers. Cell phones (Lupe) deactivate hotel room keys (bullshit rappers), which are magnetized. Shell toes (Lupe) don’t need laces (pop rappers) to be good, as Run-DMC demonstrated. So, Lupe turns off wack rappers and takes them out, respectively.

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