“Once upon a time and a very good time it was there was a moocow coming down along the road and this moocow that was coming down along the road met a nicens little boy named baby tuckoo. . . . ”
The first few lines of A Portrait of the Artist as a Young Man suggest that Joyce is trying to portray the characteristics of a young child. The words “moo cow” “nicens” and “baby tuckoo” could be words that would come from a child.