Nonveg dinner

Boy goes out to play with his friends. Shortly comes running to father - " Dad what does bastard mean ? ". Shocked father spontaneously replies " A priest is called a bastard ". Son goes out and returns to ask " Dad what are balls ? ". Father thinks and says " Hat is called balls ". Son goes out to return soon " What what is XXXXXing ?. Aworried father thinks and replies " Having dinner is called XXXXXing. Now son you will not go out. Sit and study." A while later the callbell rings, the son opens the door and on seeing the guest welcomes him " Hi ! Bastard come in,hang your balls on the hook, Mummy and Daddy are XXXXXing upstairs, I will just inform them.