And 'bout as violent as hair on eyelids (eyelash!)

from Nicki Minaj (Ft. Eminem) – Roman's Revenge Lyrics on Rap Genius

Eminem is saying that these other rappers are as violent as an eyelash, whilst producing a nice “I lash” double entendre — saying that not only are his opponents not violent at all but Eminem will lash at them regardless

Possibly a reference to the first rhyme from Em’s first single

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