Top Definition
The smelly monster who lives under your bed. Can also be a name applied to any ill-looking person whose correct name you don't know.
I heard a scratching noise under my bed last night, it must have been Slartibaritfart.

Q: Who's that slimy looking person over there?
A: Slartibartifart.
by Scott Greig September 21, 2006

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