Top Definition
Person or group who neurotically harrasses you to wear a helmet on your bike, even though riding in a car, carrying laundry down stairs, or just walking across a street statistically causes more serious or fatal head injuries every year.
God, that Helmet Nazi Kathy was practically foaming at the mouth when I told her I didn't need headgear!
di salu1999 21 settembre 2011

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