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when you are so bored you just make the noise hmmmmmmmmmmmmm, or you are thinking that someone is a complete idiot you say hmmmmmm and smile because you don't want to be mean to your friends or get in trouble by your parents by calling your little brother a supid idiot
1.
Me: Hmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm
My friend: you okay there?
Me: good question
2.
My little brother: hey that's mine! givitgivitgivit
Me: Bro it's not your chocolate, I bought it yesterday.
My little brother: ha yeah right, LIAR LIAR PANTS ON FIRE!!!!!!!!!!!
Me: Hmmmmmmmmmmmmmmmmmmm
My thoughts: Your such a Idiottttttttt
Me keeps smiling as I walk away

Hmmmmmm *hand on mouth* 

When something seems to be a bit too weird, abnormal, but still quite interesting.
"Wow, Ethan why is there a nigger in the front of the bus?" - "I am not sure. Hmmmmmm *hand on mouth* "

hmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm 

When someone doesnt want to say no but are making it blatantly obvious.
Person 1: Hey you wanna go out sometime?
Person 2: Hmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm

hmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm 

hmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm
hmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm

HmmmmmmmmmmmmmmmmmmmMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm............................ 

a very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very long way of saying "no" or "hmm" etc
Sam: wanna dance?
You: HmmmmmmmmmmmmmmmmmmmMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm............................
*awkward*
Sam: okayyy then