A billycan is a lightweight cooking pot in the form of a metal bucket commonly used for boiling water, making tea or cooking over a campfire or to carry water. These utensils are more commonly known simply as a billy or occasionally as a billy can (billy tin or billy pot in Canada).
The term billy or billycan is particularly associated with Australian usage, but is also used in New Zealand, Britain and Ireland.
It is widely accepted that the term "billycan" is derived from the large cans used for transporting or bully beef on Australia-bound ships or during exploration of the outback, which after use were modified for boiling water over a fire; however there is a suggestion that the word may be associated with the Aboriginal billa (meaning water; cf. Billabong).
In Australia, the billy has come to symbolise the spirit of exploration of the outback and is a widespread symbol of bush life, although now regarded mostly as a symbol of an age that has passed.
To boil the billy most often means to make tea. "Billy Tea" is the name of a popular brand of tea long sold in Australian grocers and supermarkets. Billies feature in many of Henry Lawson's stories and poems. Banjo Paterson's most famous of many references to the billy is surely in the first verse and chorus of Waltzing Matilda: "And he sang as he looked at the old billy boiling", which was later changed by the Billy Tea Company to "And he sang as he watched and waited 'til his billy boiled...".