Top definition
Computer/Tablet/Smart Phone, etc. anything that you can stream porn with.
During my morning whack-off my Jack-Off Machine lost its internet connection.
by Daddy (*)(*) December 20, 2011
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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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2
A large machine in which one lays under the main body of it and a metal cylinder is placed around the pecker.And when its turned on the cylinder moves up and down and jacks you off and can be make to go extremely fast.
Guys are sometimes forced to get in it as a punishment.
He's in the Jackoff machine.
by Judge dredd7 November 08, 2011
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