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Taking a shit and/or diarreah on a girls' head and then rubbing the excrement-covered cranium on the floor like a broom.
Yo I totally gave Dereks' mom a Guntilda last night.

Aw shit Norma wanted a Gruntilda soo bad, but i gave her a piledriver instead.
Gruntilda by dfreshhh October 24, 2008

Gruntildatronathan 

A giant dump that involves grunting. The word is a portmanteau of Gruntilda (the witch from the Banjo-Kazooie series), tron (to make it seem more robotic) and Johnathan (just to make it a little bit longer).
I am honking out a THICK gruntildatronathan.
Gruntildatronathan by Atlantavlad January 22, 2022

gruntellapathy 

grunting at an anonymous person whilst reading there mind about there sexual activites
AGHHH YEAH GRUNTELLAPATHY IS GOOOOOD
gruntellapathy by Jimmy Graville November 23, 2020