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may or may not be 

Quite possibly the dumbest phrase ever. As if there could, in some other scenario, be some unknown third outcome other than the aforementioned two.
Person: "He's going to be accepted into Yale."

Moron: "That may or may not be the case."
may or may not be by Skelington December 30, 2003

may or may not have 

an unnecessary phrase that precedes a story or a bragging statement.

most often used by people who are trying to sound mysterious/coy/cool, but it simply annoys the person they are talking to.

sometimes followed by "but definitely did" to make the phrase twice as useless.
Nerd: I may or may not have, but definitely did just solve the math problem first.
Normal Person: You're annoying, shut up.

Caitlin: I may or may not have met Miley Cyrus yesterday!
Mike: What do you mean 'may have'? Did you or didn't you?
Caitlin: I did!
Mike: Well you could've just said so.