What is Grundle Brush?
1.
a tooth brush like device used exclusively to remove crust from one's grundle and can be used as a derrogatory insult towards someone
dude! i totally switched my grundle brush for this guy's toothbrush!
OR
senor badass is a grundle brush for not being creative
See
2.
one who enjoys licking the grundle
Andy Bond
see taint thinner
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