D.A.D. stands for "Dumb Ass Day"
1. If you have encountered alot of dumb people through out the course of the day.
OR
2. If someone keeps doing things that are dumb through the day.
"Wow, I have seen alot of stupid people, it must be a D.A.D.!"
"You keep doing stupid things, your having a D.A.D.!"
