Top definition
A made up fictional monster that Author, Judy Miceli, wrote about in her book "Scaring Bryan!" That would come out at night and attack children who would not listen to their mothers.
Bryan, if you don't go right to bed and do as your told the Gullywumpers will get you tonight.
by Steve Rodhouse September 21, 2006
Get the mug
Get a gullywumper mug for your brother G√ľnter.