boil the fat off a taxicab driver's neck

@windhair (498)
Germany
November 2, 2007 1:42pm CST
Often called just Bella, she was recongnizable everywhere by her big hats and a voice that Norman Mailer said "could boil the fat off a taxicab driver's neck." This is a short paragraph about Bella Abzug, but I can not fully understand this part. What does "boil the fat off a taxicab driver's neck" mean in this sentence?
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