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A day where you celebrate getting something done, and letting other people know about it.
Similar to high fiving yourself though not as awkward.

You can plan a woohooday and be a real pain to everyone you work with when you shout "WooHoo" everytime you tick something off your to-do list.
"If you're having a woohooday, let somebody know why. Better yet...just shout WooHoo and don't tell them why."
by zazrock June 17, 2016
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