Talk to the Hand

So dad’s cousin Vic is showing us all how his android phone can can look up words from his voice.

Vic (to phone): Ok google, ‘Juachin’.

Vic then looks up at us all watching him.

Vic (to us): Jeeze you guys must think I look silly talking to my hand.
Phone (Google responds):  Used as a contemptuous way of dismissing what someone has said (often accompanied by a gesture in which the palm of the hand is held in front of the original speaker’s face). “talk to the hand, girl, ‘cos the face ain’t listening”.