Our kids when small were "bobbins" from the movie "Willow."
My sister-in-law says that when you walk into a room and forget why you came, you have "destinesia."
Umbrellas are "underbloats."
We sing "Aardvark carols" as in "Aardvark herald angels sing..."
When my nephew was small, dust bunnies became "Arnamus" and we never knew why, nor why he was frightened of them.
My younger daughter spoke of fastening "beat belts", her "belbow", and my personal favorite, "belly beans."