It is when you have so much to say, but then don't because either you are not sure about it or just feel lazy to think about its relevance
My colleague: Happy 2021! Hope you had a nice break.
Me: Same to you. Yes it was a nice quiet one. Hope you had a good one too
My colleague: Yeah I did. Was just glad to stay away from tech
Me: Hmm...
My colleague: I have been kind of annoyed with the lockdowns as it has limited my outdoor activities and made me circle back to tech for relaxation
Me: Hmm...
My colleague: Sorry for whining :)
Me: Hmm...
My colleague: Are you alright amigo?
Me: Yes, all good.
My colleague: No, just think you might be suffering from the 'Hmm...syndrome'
Me: Hmm...lolz...
Like the word hmm it means that your thinking, but when one says hmms instead of hmm it shows that they are thinks over multiple things at once.
Sally started to zone off and before she knew it an hour had passed. When she was conscious again she siad "hmms" signaling that she was lost and confused.
A thinking phrase. Held out a bit longer than "hm" as it has more m's.
Hmm...What should I do today?
What do you want for breakfast?
Hmm...maybe some pancakes.
exclamation of thinking.
Leafy, BFDI 1b: "Hmm... — aha! Ice Cube, come on down, you can be my ally."
the bland reply given back to you after you text a friend an entire ranting essay... its very very annoying
also implies that your friend is really really bland and boring and needs more spice in their life
As soon as she replied back with a "hmm", I knew what kind of person she was... neutral, chill, unbothered and boring.