Top Definition
A grumplebump is a person who is acting grumpy out of character. They are regularly very good natured but are now acting grumpy without apparent reason.
:Hey did you talk to that nice girl Bonnie today?

:Yah I did but she was acting like a douche and being a total grumplebump.
by Chody Dootch October 11, 2011

Free Daily Email

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

Emails are sent from We'll never spam you.