What is a caffeinator?

"Caffeinator" is not a commonly used word with a specific definition. However, based on the root word "caffeinate", it's likely to be an informal term used to describe:

* A person or thing that causes someone to feel energized or alert, similar to the effect of caffeine. This could be:

* A type of beverage or food containing caffeine.

* A person who frequently consumes caffeine.

* A stimulant or energy booster, not necessarily containing caffeine.

* A device or process that adds caffeine to something. This is less common but could refer to a machine that adds caffeine to coffee beans or a product that infuses caffeine into other substances.

Without context, it's difficult to be sure what "caffeinator" means. If you provide more information about where you encountered this term, I might be able to give you a more specific answer.