1 definition by tinygiantman

Top Definition
The day of the week or fortnight where a young male is aroused slightly more than usual and has the accompanying false confidence that lead to an increased presence of actions of questionable wisdom.
I might wait 'til dumbass day to open that. It never works any other day.
by tinygiantman August 01, 2018

Mug icon
Buy a Dumbass Day mug!