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Stands for "I will think of you when I masturbate", A creepy message to put in the back of your classmates yearbooks.
"Julie, HAGS! See you next year! IWTOYWIM!"
by Urban Dictionary January 26, 2009
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An acronym for "I will think of you when I masturbate"
Beautiful Woman: "Hey Jarret, IWTOYWIM!"

Handsome Young Fella: "What does IWTOYWIM mean?"
Beautiful Woman: "I will think of you when I masturbate..." ;) ;D 8D
by jroeishere June 17, 2016
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