1 definition by YlemRat

"I Must Diff" is something you say to express your disagreement with something.
Bobby: Hey dude, did you know that Amelia Earhart survived the crash! She's still alive! Totally! I read it on Wikipedia!

Gilgamesh: I must diff. Uhh.. dude. She's dead.
by YlemRat March 28, 2014
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