A character admits, usually amusedly, that they don't even know what they just said. Sort of a self-deprecating admission of Insane Troll Logic. Examples:
- In the RiffTrax for The Star Wars Holiday Special, there's this exchange.
Kevin: Hey, they stole the background to Family Affair! Wait until Mr. French finds out.Mike: They'll find out why they call him "Mr. French."(pause)Bill: (laughing) I don't even know what that means!
- From RedLetterMedia's review of The Phantom Menace.
George Lucas: It's like poetry, it's sort of, they rhyme.Plinkett: Yeah, George, that's true, but the only thing poetic is that I was vomiting in stanzas. (beat) I don't even know what that means.
Hello, Unknown Troper. You'll need to get known to lend a hand here.