Definder - what does the word mean?

What is Tell me something i don't know?

TMSIDK is the abbreviation of Tell Me Something I Don't Know. To show sarcasm at the obvious.

Person 1: "It's raining out"

Person 2: "Tell Me Something I Don't Know"

Can also look at sites like www.tmsidk.com for more info.

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Tell me something i don't know - video