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Dum dee dum is comonly used in Messenger conversations when either
a. you have nothing to say
b. you are waiting for a reply that is obviously taking too long
c. you are bored.

Originated in the Whinnie the Pooh books
So steve, will you help me with my sos assignment..

(no reply)

dum dee dum... hello?
by Noobzor August 31, 2005
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a happy word, used when humming a song mostly.
dumdeedum im gonna go to lalaland tomorrow!
"dumdeedum da-dumdeedum ; just enjoy the show!"
by hahahahahahahahNO. April 03, 2010
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