A subsitute for F*ck You, used in the presence of teachers and/or parents or guardians. Also the name of a Chinese man with a very long mustache and an eyeglass.
You slept with my mom?!?! Fuu Man Chuu!

Did you just steal my Algebra II answers?!?! Fuu Man Chuu!!!
by NonAnonymous Ninja August 04, 2010

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