Build your fences, we digging tunnels
Can’t you see we gettin money up under you?

from Kanye West (Ft. Jay Z) – Otis Lyrics on Rap Genius

Meaning

While you’re cutting people off, they’re making connections to get more money.

The idea of digging tunnels around fences recalls the current immigration situation with its “Great Wall of Mexico”, and seems to suggest that as a black man, Jay is gate-crashing the white-dominated socio-economic elite, getting his money by any means necessary.

Alternative explanation: This is a reference the Mexican Cartels incredible power and ingenuity. There have been many stories in the news where the law is finding sophisticated tunnels connecting the US and Mexico where thousands of pounds flow into the US.
America thinks walls are the solutions when the cartels are two steps ahead and already bypassing their “walls”

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