cho-cho
Butterfly. It's written as "cio-cio" in Italian, and Cio-cio is the name of the main character in the opera Madama Butterfly. In English it is usually spelled cho-cho. It's used more commonly as a pet's name than as a slang word for butterfly.
Example:
The calico kitten was dappled with so many colors that she looked like a pretty little butterfly. He decided to name her Cho-cho, his pretty cho-cho.
The calico kitten was dappled with so many colors that she looked like a pretty little butterfly. He decided to name her Cho-cho, his pretty cho-cho.