I invented violence, you vile venomous volatile bitches

Meaning

This is Slim conspicuously manifesting his lyrical ability with the technique of alliteration.

First Slim sets the proposition that he invented violence which indicates he is terrible in all departments as a human — thus he sends an insult straight after, displaying impolite attitude.
‘You vile venomous volatile bitches’ signifies that some people (most likely women since he says bitches) astoundingly metamorphorsise when hearing his lyrics; they instantly become skeptics as they take his lyrics to be genuine when ‘Slim Shady’ is merely an Alter Ego.

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