What is the meaning of Cooker?

A cookstove.

An appliance or utensil for cooking food.

One who cooks.

Ellipsis of cooking apple.

A person who makes or uses illicit drugs, especially methamphetamine or cannabis.

The container in which recreational drugs are prepared.

A person who is cooked in the head; a crazy person.

A conspiracy theorist, especially one who is involved in politics.

Source: wiktionary.org