Theory Theory no Mi (Noun) is a phrase sometimes used among One Piece fans towards the other delusional fans in situations in which the idiotic fans construct the most ludicrous and farfetched fan theories you had the displeasure of listening to. These theories can range from being somewhat comical to completely confusing or frustrating, depending on how much stupidity you can stomach.

The phrase was named after the Devil Fruits, a fictional fruit in the series that grants the eater a supernatural power, such as the Gura Gura no Mi (Tremor-Tremor Fruit) These fan theories perhaps are thought up due to the expansive lore of One Piece.
Neanderthal Fan #1: Hey guys, check out this new fan theory my friend and I created! Basically, it's highly implied that Nami was pregnant with Sanji's baby during the Thriller Bark arc.

Normal Fan: That's fucking stupid. If Nami was pregnant, wouldn't she have given birth by now?

Neanderthal Fan #2: Well, if you let us explain, there's a large amount of evidence that Nami aborted her baby after-

Normal Fan: Shut yo Theory Theory no Mi ass up, bitch.
by Gandalf Lover 34 April 29, 2022
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