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 23, 2009
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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.
by Butterflyhottie February 2, 2010
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