Top Definition
An over use of the words 'hmm' 'urmm' 'ummm' 'Mhmm' or any other derivative. It's when people are thinking too much but have a lack of anything better to say.
Me: He left me, so rude, I wonder if I have done something wrong?

Matt: Hmmm

Me: he says I've changed, do you think I have?

Matt: hmmm.. oh no, I double hmm'd. =O

Me: Oh noes, you've got Hmm disease!!
by Kerry E June 11, 2008
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