Pop iron
Trying to make a hole for you like linemen

from Roc Marciano (Ft. Ka & Knowledge The Pirate) – Not Told Lyrics on Rap Genius

Meaning

In American Football, offensive linemen block defenders to make room for their running backs to run through. The room they make is often referred to as “holes.”

Roc is also using “hole” in a literal sense as in making a bullet hole in someone after shooting them

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