In lamens terms means to shut your mouth. Relates to a similar term, shut your face. Should be used often to annoy others and preferibly with a slight accent. Can be shortened if neccesary to "cha chu" or in emergency to "cha", but only in emergency.
(in Vegas, 7 am) "Dude, you are going to die if you snort anymore blow."

response "CHA CHU MAO!"
by Awesome February 26, 2005
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