It’s the day in-between Tuesday and Thursday, also colloquially known as the “turducken of weekdays” or wednesdays
“We have a date scheduled for this Tursday”

“What time are we meeting up for Tursday happy hour?”
by AlohaPrab June 18, 2020
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I went hula dancing on a Tursday in Texas.
by southern frand June 16, 2017
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