I used to love to play my demo tape when the system yanked
Felt like I was almost signed when the shit got cranked

from Kanye West (Ft. GLC & Paul Wall) – Drive Slow Lyrics on Rap Genius

Meaning

When Kanye heard his own music being listened to by someone else, he felt like he was signed with a record label.

By “system yanked” he’s simply referring to when the stereo system was ready to play

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