Re: 'Meh'
The tongue click by separation of tongue from palate to express disapproval, and the one that is incorpated as a consonant in Xhosa, which children everywhere like to play with, also the glottal catch in Scots, no doubt all go back to our prelingual chimp-like ancestors.
OED may not mention the onomatopoeia of 'tut' or 'tsk', but it is blindingly obvious.
Biting the hand that feeds IT
