Cause all my life I was told and taught I am not shit
By you wack fucking giant sacks of lying dog shit

from Eminem – Legacy Lyrics on Rap Genius

Meaning

Teachers, peers, those in places of assumed trust and placed authority told Em that he wasn’t worth anything, they told him he wasn’t shit, but contrary to their words, Em proved them wrong, and realized that they’re giant sacks of lying dog shit.

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