Top Definition
A parasitic worm that eats one's brain and makes them only want to play Line Rider when one has played too much 'Line Rider'. Is not literal.
If you don't stop playing Line Rider you're going to get line rider monkey worms in your brain and all you're going to be able to do is play Line Rider.
by DarkfireLovesHetalia November 09, 2010

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