Indifference; to be used when one simply does not care.

I couldn’t care less (but one must keep up appearances, right?)

An expression of of indifference or of a judgment of mediocrity; a verbal shoulder shrug.

When you just don't care about the subject.

"The verbal equivalent of a shrug of the shoulders." -quoth me

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’.

This is a universal, non-commital answer to every question ever posed. Its the answer that deosn't actually give any answer.