We going back to goin' in, you gonna need a Garmin

from Lupe Fiasco (Ft. Travis Barker) – Joaquin Phoenix Lyrics on Rap Genius

Garmin is a brand of GPS

When Lupe’s goin' in you’ll get lost, cause his flow is nuts — so get your GPS. And since he is repping the world, you will need GPS (Global Positioning System) to follow Lupe.

Taking you back to the beginning of the song when he said:
“I be throwing up my set, yes
Earlin' up the world and
Going out, we goin in, say "hello” to my girlfriend"

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