spud

noun: A person, usually male, who is not all there

"Get your fingers away from that chainsaw ya spud"

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unit

noun: a person who is indescribably crazy or insane such that others are ashamed of them.

"Geez that Miley Cyrus is a unit"

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crack

To try or have a go at doing something

I might as well have a crack at this twerking thing.
Go on, have a crack at it!