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1.
it refers to ones butt hole, also known as asshole or anal entrance.
John: Where's the pipe?

Andrew: In my Buh Ho.
by traphouse heroes January 29, 2011
 
2.
the act of saying butthole very fast to the point where it is 1 word
Glenn put his arms on the table and screamed BUHHO
by the horned elephant February 14, 2012