Here are some examples:
* A can of soup: A metal container holding soup.
* A can of beans: A metal container holding beans.
* A can of paint: A metal container holding paint.
* A can of soda: A metal container holding a carbonated beverage.
The phrase "a can of" can also be used figuratively, often in expressions like:
* A can of worms: A situation or problem that is likely to lead to many other difficult or unpleasant problems.
* Open a can of whoop-ass: To start a fight or confrontation.
Ultimately, the specific meaning of "a can of" depends on the context in which it is used.