Speng

Speng, or the action of being Spengy.
A term used to describe someone who spurts nonsense, or does activities that are generally considered unintelligent.

Alfie and Thomas are being complete Spengs!

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Guan Shing

A word to describe a really bad, or malfunctioning arcade machine.

Person: "That machine fell over! It must be a Guan Shing!!" "What a teaser!"