Then we started to rhyme like we pretend to load our pens with lead

from Slaughterhouse – Coming Home Lyrics on Rap Genius

Meaning

Slaughterhouse is metaphorically loading their pens with lead (ammunition), because they are killing every beat they hop on. Its like their shooting down their competition with their rhymes.

And the literal meaning, they use the lead in pencils when they write their rhymes.

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