This thread reminds me of my younger brother, who as a preschooler always called a horse (in the late 50s) a "biddlumbumbum." My parents and the other grownups were baffled and spent a good deal of time trying to figure out why. They proposed absurdly lame (to my eight year old ear) explanations, such as "Maybe he's trying to say big animal?" It seemed a prime example of the denseness of the grownups. This was the era of The Lone Ranger and his themesong, the William Tell Overture, and in that era every kid riding a toy horse accompanied it by the overture: "biddle um, biddle um, biddle um bum bum."