I pistol whip that nigga till his face was purple
I need anger management, see I hold on to a grudge
The same way I hold on to that nickel-plate Snub

from 50 Cent – Then Days Went By Lyrics on Rap Genius

Meaning

“Hold a grudge” means that someone annoys you however you keep your anger in and don’t retaliate to the actions that have caused the annoyance.

A “snub” is a snubnosed revolver (which are normally nickel-plated).

Wordplay with the words “anger management” and “grudge”. When you keep a grudge you keep in anger, anger management is when the patient is taught how to not retaliate and keep their anger in.

50 needs anger management therapy as he can’t hold a grudge (he retaliated by hitting his uncle).

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