Top Definition
the act of fapping so hard while playing super Mario, that it sounds like thunder
Mike: dude, what happened to your arm? did you hit the gym or something?
Mark: nope
Mike: then what?
Mark Italian thunderfap!
Mike: all day everyday!
by Dr. Dro October 07, 2013

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Lotsa space for your liquids.

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The Urban Dictionary Mug

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The Urban Dictionary Mug

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