Top Definition
Sarcastic synonym of 'good job' or 'nice one'. Obviously can also be used to wish someone happy birthday, but generally the term is derogatory.
Person 1: I didn't wet the bed last night!
Person 2: ...Herpy Derp Day to you.
by Uthislith December 05, 2011

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from daily@urbandictionary.com. We'll never spam you.

×