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Another term for a crash helmet.

A smack hat is similar in type to those worn whilst riding a lambretta or vespa. It is typically a visorless helmet that is most effectively positioned on the head by the use of a smack from the hand on the top of the helmet from a helpful friend.

A device to protect your head when it 'smacks' into an object.
Jimmy could really have hurt his head when he came off his scooter, but luckily he was wearing his smack hat.
by maadmaxxer April 22, 2010
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