What's a Tsum Tsum? Well to start with, the term Tsum Tsum is a type of Japanese slang that means "stack stack". They are cylinder shaped plushes that can be stacked on top of each other, and they are made by Disney. Tsum Tsums started in Japan, and they have since become quite popular. Along with the big and mini plushes, there is a wide variety of other Tsum Tsum products, including pillows. There is even a Tsum Tsum cellphone app, as well. If you want to see exactly what Tsum Tsums are, there is also a picture below for reference. I would also like to add that I think these little guys are really cute. So please, check them out for yourself!