That Lorena Bobbitt chopper'd
Knock a weenie off,

from Eminem (Ft. Mr. Porter & Royce Da 5'9") – Westwood Freestyle 2010 Lyrics on Rap Genius

Meaning

Lorena Bobbitt was an American woman that became infamous in the early 1990s for cutting off her husband’s penis. Royce’s chopper (AK-47) would kill a wussy guy (“knock a weenie off”), much like Bobbitt literally knocked a weenie off

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