Sunday Funday as explained by the Urban Dictionary:
By celebrating "Sunday Funday" you can extend your weekend festivities just a little longer before hanging up your party pants. This day typically starts out with mimosas or bloody marys. It then continues throughout the day until you find yourself wasted by about 6:30ish. Since the "Funday" ends early enough, you can rest assured that you will pass out early enough to be perfectly refreshed for work on monday morning.
This Sunday Funday design is printed on a Softstyle Unisex Tee (They are not preshrunk).