mumble
mum.ble \'m*m-b*l\ \-b(*-)lin\ \-b(*-)l*r\ vb or mum.bling [ME momelen, of
imit. origin] : to utter words in a low confused indistinct manner : MUTTER
1: to utter with a low inarticulate voice 2: to chew or bite with or as
if with toothless gums - mumble n
Webster's English Dictionary