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It comes from a canadian boy by the name of Gavin Phillips a.k.a. Big G

a ratymister is a combination of a rat and a mouse found in Gavin's cupboard.
"Is that a Mouse?"
"Is that a Rat?"
"no! It's a Rattymister!!"
by fuck boy January 11, 2005

Words related to ratymister

rattymouse ratza ratzeke ratzy raubaix