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1.
"buttmaster" is a new zealand slang term for someone that is considered to be very good at everything s/he tries. usually exceptionally good looking with chiseled features. a buttmaster is typically found inside a pub.
ben the polak is such a buttmaster that i've never seen him fail anything he has tried. he has chiseled good looks too.

man, you're a real buttmaster aren't you.
by jimmy the thompson March 19, 2007
 
2.
The person that a butt monkey would follow. Can also be used as a verb.
In the movie, Mean Girls, Regina is the butt master and Gretch and Karen are the butt monkeys. (Think leader and followers)
ex. You need to butt master that seriously... OR... She totally butt mastered him!
by levicel September 28, 2004