1 definition by John Palumbo

Top Definition
Similar to lockjaw, a painful cramping of the jaw caused by the continual sucking and repetitive up and down motion of giving a blowjob. Usually caused by a large and girthy penis, known as a mooseknuckle.
Oh my god, his dick was so big, sucking him off gave me the worst case of moosejaw.
by John Palumbo November 09, 2007

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