The third baseman on Abbot & Costello's baseball team in St. Louis.
Costello: If I mentioned the third baseman's name, who did I say's playing third?
Abbot: No, Who's playing first.
Costello: Stay off of first, will ya? What's the guy's name on third base.
Abbot: No, What is on second.
Costello: I'm not asking you "who's on second?"
Abbot: Who's on first!
Costello: I don't know
Both in unison: THIRD BASE!!!!!!!!!
by pleesedu naht ask May 29, 2006
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Phrase from the early 80s Nickelodeon television show You Can't Do That On Television that, when said, would cause buckets of green slime to fall on that person
- "Hey, where'd Moose go?"
- "I don't know."
by tofoomeister December 08, 2004
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A passive aggressive way to avoid actually asking a question directly.

Also: A passive aggressive technique to make an assertion, give direction, make a suggestion.
I don't know if you're going to take out the trash. It's in the garage.

I don't know if you like your shoes with that outfit.

I don't know if you wanted that chicken sauce on your shirt.
by OriginalDookie July 10, 2017
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The inability to give the correct answer, even if there isn't one. And you know no matter what answer you give, it's WRONG!
Boss Man: Mark?
Mark: Yes?
Boss Man: What's 1+1?
Mark: I don't know.
by Steve Monty May 24, 2007
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I don't know
You: wats 1+1
Your dumb ass friend: I don't know
by I don't know 666 February 23, 2018
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A subtle way of expressing how poorly you think of someone. A form of shade.

Coined by Mariah Carey, in 2003, when she was asked about whats he thought of Jennifer Lopez.
Samantha: "Weren't you best friends with Alana?"
Emily: "I don't know her"

Mary: "Are you and James still dating?"
Emily: "I don't know her"
by just like honey September 01, 2017
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