The term 'Hot Roller' can be summarized as a four-letter word, 'LAVA'. LAVA is molten rock that is expelled from a volcano during an eruption. It is extremely hot and can cause destruction to anything in its path. Hot Rollers are also a type of hair styling tool used to create curls and waves in the hair. The rollers are heated up and then wrapped around sections of the hair to create the desired look.