look up any word, like dirty sanchez:
 
1.
Something to say when you're either

a) Have nothing to say
b) Waiting on someone who is obviously taking too much time to respond
c) Bored

Dum dee dum is a different version of Dee dum dee
Person 1: Dee dum dee
Person 2: What?
Person 1: Nothing, just bored.
by Jokerfool09 January 06, 2011