They're all weirdos, DeNiros in practice

from Jay Z (Ft. Beanie Sigel) – Ignorant Shit Lyrics on Rap Genius

Meaning

A reference to the famous final scene in Martin Scorsese’s film “Raging Bull (1980),” in which DeNiro’s character, Jake La Motta, practices reciting, in the mirror, the same famous monologue once given by the great Marlon Brando in the film “On the Waterfront (1954)”

http://www.youtube.com/watch?v=KLNft6cO0I4

A reason Jay-Z would be drawn towards referencing Deniro is he has a long history of playing mobsters in gangster films, sort of a go to for many rappers. Including but not limited to Johnny Boy In Mean Streets, The young Vito Corleone in the Godfather 2, and Al Capone in the Untouchables

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