And everybody talkin' money
But they ain't showing numbers like the call block

from Meek Mill (Ft. Birdman, Diddy & Travis Scott) – I'm Leanin' Lyrics on Rap Genius

Meaning

Meek is pretty much saying that similar to a private call one receives when the person calling you blocks their number from showing,a lot of rappers in the game are talking numbers (as in vast funds accumulated tru rapping) but aren’t showing their numbers

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