On May 21, you can use any random fake shit you find on Urban Dictionary and sent it to someone as a joke. On May 22, you must explain the joke and the reason why you sent the Urban Dictionary definition.
*May 21*
Mark: Hey Lisa! It's national get a girlfriend day! Look at this screenshot from Urban Dictionary!

Lisa: Um.. I'm lesbian. I thought you knew that.

*May 22*
Lisa: Oh I get what you said yesterday! It's International Explain-Joke Day! This is the part where you explain that yesterday was a joke right? Thank god, I'm literally fucking lesbian you dumbass.
by overweightmilf May 21, 2021
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