My dear singing three year old has added a new song to his repertoire. He is a very joyful child and the little things in life cause him to sing! Throughout the day now we hear him singing Alleluia followed by whatever his latest joy is. Yesterday it was "Alleluia, blowing bubbles!" Today it was "Alleluia, monster truck!"
I posed the idea that "I don't think that word means what he thinks it means". Katherine disagreed, saying that it means exactly what he thinks it means. She is right. He is expressing his heartfelt joy for the gifts of childhood that God so generously bestows on him everyday. He might not be able to tell you that, he only knows that life is good and worth singing about!