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A ten inch foreskin. Which can also be used to make fun of someone.
Oh my fucking god that guy had a man-hat-ten.

Dude your such a man-hat-ten
by DR.MAN-HAT-TEN January 30, 2010
Getting a blowjob while playing Call of Duty
My girlfriend was giving me a Manhatten and i still went positive.
by Mr. Manhatten June 07, 2011