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a nuisance, something that ditracts from getting things done. This is a variation on "a monkeywrench in the works" which dates back to the industrial revolution. If a wrench were to fall into the gears of the large factory machine, it would make everything stop.

monkey in the wrench was first used in the movie Die Hard in 1988. In the film, the hero is a cop trapped in a highrise building full of terrorists. After killing several of them, he talks to their leader via a cb radio. When the villain asks who he is, he states,
"Just a fly in the ointment Hans, a monkey in the wrench, a pain in the ass."
by Bobby White June 30, 2008
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Nov 27 Word of the Day
A stupid person; it refers to the lack of surface area on an individual's brain. The general thought is that the more surface area (wrinkles, creases, etc.) a brain has, the smarter the person is. Conversely, a person with a smooth brain (no wrinkles) has less surface area and would therefore be stupid.
That fucking smooth brain put his shirt on backwards again...

That smooth brain is dumber than a pile of shit.
by Tip Tank May 14, 2011
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