Buckatialnyip is a whimpultarfumppletang dialect word used to point out someone's very pungent foul smelling body odour or in order to correct someone mistaking their own body odour as a foul smell. This could also be a person with a smelly natural musk.
Buckatialnyip is pronounced buck-tial(like the end of Nuptial)-nnn-yi-p
Michael: it smells like death here
Angus: its your buckatialnyip
or
Angus: you are buckatialnyip Michael