What is a marshmallow gun?

A marshmallow gun is a toy that shoots marshmallows. It is usually made of plastic and has a spring-loaded mechanism that propels the marshmallows. The marshmallows are loaded into the gun through a hole in the back, and when the trigger is pulled, the spring is released and the marshmallow is shot out. Marshmallow guns are often used for target practice or for playing games. They are also sometimes used as a way to get marshmallows into someone's mouth without having to touch them.