Skip to main content
Dictionary
Dictionary
Store
Blog
World
Help
Advertise
Chat
System Status
Do Not Sell My Personal Information
Information Collection Notice
reCAPTCHA Privacy
Terms of Service
reCAPTCHA Terms
Privacy Policy
Accessibility
Report a Bug
Data Request
DMCA
© 1999–2026 Urban Dictionary ®
Words of the Day
Browse
Add a Definition
User Settings
Definitions by STD-WillyDoIt
National Dumb Day
Share definition
Flag
January 5th
of
every
year
“When is coopers
birthday
?” Same
day
as national dumb
day
… January 5th
National Dumb Day
by
STD-WillyDoIt
November 5, 2025