The very rare merging of the commonly known douche and the largest known tool to man.
Signs that someone you know is a douchetool include:
They sporadically engage in random Tourette-like fist pumping.
They claim that they get many women when in fact they do not.
They proceed to change their facebook name to something that is different than their real name.
They are commonly known to flake on you if your not out on the lake because of their weird lake fetish.
DoucheTooth(noun)A phone accessory which generally goes in ones ear that lets everyone know you are a super important douche and way too busy for in-person human contact.
Jill: honey I have something really important to tell you. I ha..
Dave: (toggles Douchetooth and interrupts) Sorry babe I gotta take this.
Jill: your a f*ing douche