A phrase commonly used for absolutely no reason at all. Although sometimes it is used while thinking, it's mostly used during awkward pauses just to fill in the gap of silence, or just cause.
Alyssa: Coolsicles :)

30 seconds later...

Alyssa: Hmm.
Holden: What is it?
Alyssa: Nothing... I just like saying hmm.
Holden: Ok... weird girl.
by That_One_BV_Guy July 2, 2009
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hmm, do I rather be kicked in the balls twice, or have DJT Re-elected as the president?
by kalant November 30, 2018
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A teacher's way of avoiding conversation or uncomfortable situations
Me: This assignment makes me want to kill myself
Sladek: Hmm
by Hattmann March 8, 2019
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The wise man say hmm no to man who have no beard
You: 1+1=2!!
Wise man: Hmm no very unwise it is 5
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