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Mentallatio is simply put, fellatio of the mind. When something absolutely unbelievable, or extraordinary is learned, heard, seen, or discovered in anyway, mentallatio occured. Simply put, mentallatio is to have your mind "blown".
"Dude, learning about black holes and wormholes and all sort of crazy stuff was intense."

"Talk about mentallatio"
by Mikey Cons April 10, 2008
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