It's when you tell someone a riddle with your finger inside their anus.
Person 1: You wanna hear a jacobi mindgame? Why did rthe chicken cross the road?
Person 2: Oh that feels nice...
When a hoe doesnt want shit with you until another one does.
Bro1:" So she agreed to go out with the group after you invited another girl?, My man she's playing some bitch mindgames with you"