Top Definition
-noun (jack-in-auf)
The name of a white child who is born by a child of the 'Knauf' family and some white girl. This kid will be the Jesus of all kids in his age group, and largely known through the United States and Canada. Also known as, masturbating like a jack hammer onto your girlfriend.
Chuck Norris - Dude, do you see that kid?
Britney Spears - Who, Jack Knauf?
Billy Mays - Yeah, he's awesome.
Britney Spears - I know.
by bfont May 11, 2009
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