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2.
A day to let loose and let out your inner toat.
" It's Punday ! "
" Ayay Doat ! "
by Thamb December 10, 2008
 
1.
a designated day of the week, month, or year, in which everyone may make stupid puns all day
When I’m the boss, we’ll be having Punday every week.
by elsquid January 30, 2014