A showing of indifference on a subject, usually with a lack of emotion, and a tone of say 70% negativity towards the idea. Usually the person's mood is very calm and collected and would rather just lay back and chill.
Definition---
Indifference; to be used when one simply does not care; know how they are feeling; to feel nothing. ‘Meh’s can be strung together to highlight the intensity and severity of the unknown non-feeling(s). In this scenario the recipient of the meh meh meh syndrome can be mistakenly perceived as ‘depressed’.
Example:
Thor: Mortal maiden, I seek the presence of your lips. I command you to come forth! {smashes plate on floor}
Girl: Meh.