katlaughing,

I agree with you that the saying "talk to the hand" cuts across racial/ethnic lines in the USA. What I meant to suggest was that the probably origin {or one of the probably origins} of this saying/hand gesture is African American folks via African and African Diaspora traditional and contemporary sources.

While "the origins and meanings of body gestures" might make an interesting Mudcat thread, in my opinion, continuing to post about this subject in this thread is a distraction from and a disservice to this thread's stated topic.