Helmet

hel·met
   hell-meht noun
A means to describe someone's intelligence referring to a mentally unstable person. One who wears a helmet to protect them from injuring themselves because they cannot function for on their own. Can also be known as slang.

1)

A-"I heard Greg got a 39% on that test last class"
B-"What a helmet!"

2)
A-"Hey you f***ing helmet"

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