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1.A small fiendish creature with jutting incisors and a receding hairline that typically dwells in sewage pipes.

2. An amphibious troll.
Tom was surprised by the fierce bite delivered by the small ghoulie as he sat down on the toilet.
by whuffie September 27, 2005
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2
Another word for derriere, behind & bum.
Lauren: Oops! I just knocked over that glass with my ghoulie!
Geoffrey: Oh, you and your ghoulie!
by HoldenPhrases May 16, 2011
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