Kissum and Tuma

Kenedi has created the names Kissum and Tuma that she assigns to people when she wants to play.  She'll says something like 'you be tuma and i be kissum' and then will proceed to play according to these people.  We have NO IDEA where the names came from.  none.  her little imagination made them up.  Tonight Addi was Tuma and she was Kissum and when i told everyone to go brush their teeth, Kenedi turned to Addi and said'night Tuma see you ttmorrow!;