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Also known as Friday as the first half of the day is noted as a 'weekday' while after work/school, the rest of the day is noted as part of the weekend. Hence the combination of both 'Weekend' and 'Weekday'.
Cool Kid: Hey dude! Lets go to the mall this weekend

Cooler Kid: Nah, Lets go next weekenday!
by Stevey Bee July 22, 2010