noun- the cardboard tube in the middle of a roll of toilet paper or paper towels.
take off the dir dir and put on a new roll!
by starx4x2x0@yahoo.com August 19, 2010
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A common phrase used to explain to someone or something that he/she/it just said/did something that was stupid. It can also be shortened to just "dir" depending on how it is used.

Another common term used instead of this phrase is "derp". If someone/something is to have "derped", it's a similar concept.
Man: "The sky is blue."
Woman: "Dir da dir!"

(Friend realizes he/she was wrong about something and expresses a smile of shame and embarassment)
You: "Dir!?!?????????"

Woman #1: "How did Jane get that question wrong? It was so obvious!"
Woman #2: "She derped."
by D0NKEYKONGA December 5, 2014
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