When you don't know the lyrics of a song and you try to reproduce how it sounds more or less
Joe: Hey! Have you heard about this new song? It sounds like this: nana na na naaa....
Mary: Oh man! You're humming it so badly that I've no idea what was that.
by Eleniuss August 31, 2016
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Something with an extremely strong smell. Can be used in positive and negative manor!

Used in Ballymena northern ireland
"Lad your cane is humming!" Or " wow that grass smells humming!"
by weweeben June 07, 2018
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What someone says as a response to something casual or unimportant. Often used as a conversation closer.

Also used when trying to sound cute or unique.
Mary: I'm going to eat dinner.
Sam: Have fun.
Mary: XD
Sam: Hum Hum.

Karly: I'm almost done with my homework!
Todd: I'm not. Hum hum.
by FluffyCat September 10, 2010
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Phrase used as synonim to thinking about the problem which had apperaed or as a respons for moronic question.
A: Do you want to make some quests or stop playing?
B: hum hum

A: Only pr0 play Tibia
B: hum hum
by Bogumil May 10, 2006
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Watch me hum this rock

You absolutely hummed that rock dude
by mrorange12 September 24, 2020
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used to describe a person with an afro. usually VERY annoying and has SWAG. sings off tune.
Hum-Hum: la la la laaaaaaaaaaaaaa im soooooooooooooooo coooooooooooooolllllllll
by PIGGYWISDOM February 26, 2013
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