Banana Friday is a tradition where people wear yellow colored clothes on Friday. Eating bananas is also strongly encouraged. When people are asked why they are wearing yellow, they must exclaim, "because it's banana Friday!"

Anyone can start a banana Friday movement so long as two or more people wear yellow clothes on Friday.
Person 1: Why are you all wearing yellow shirts?
Person 2: Why because it's banana Friday!
by TheRealTorizzle February 2, 2015
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