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1.
A person who resides in a butthole or anus, if you will. A person who acts like where they reside.
"Stop being a buttholian"
by sunnyapes June 22, 2009
 
2.
an annoying, crude, or obnoxious person. A person that is usually a smart ass.

a person that is such an asshole that they have their own species, if your an asshole and your family members are assholes, your probably buttholian.
your a stupid buttholian!
by Butterflyhottie February 02, 2010