mouthing

noun2

1. •
   The act of forming a shape with the mouth.

   • Mouthings tend to occur most often when signers are manually articulating nouns, open-class items, and morphologically simpler signs (see Crasborn et al. 2008). — 2013
2. •
   Ranting; passionate speech devoid of meaning.

   • Kearn did not rant, he did not deafen you with heroics and empty mouthings. — 1941