I have a strange question. My Mother-in-Law played this game with my children where she would open and close her hands and say "jam-jam," and then point at her palm and say "gun-ji gun-ji." I was wondering if anyone else had ever heard of this before, knew where it came from, and knew if there were any other hand signs and phrases? Thank you very much.
Ah, you are a layman. Then let me speak in technical terms.