(idiomatic) A complex, troublesome situation arising when a decision or action produces considerable subsequent problems.

(games) A children's game similar to hide and seek, with the addition of a target such as a flag.

(informal) I cannot do it.

A device used to open tin cans, usually by slicing the lid off. / (roller derby) A shoulder hit to the chest, usually accomplished while moving from a crouched to a standing position.

A lightweight metallic can containing beer.

(slang, boxing, derogatory) An inferior fighter in the sport of boxing. The insinuation is that an up-and-coming fighter takes on a "tomato can" to burnish his reputation and record.

A pressurized canister that ejects its contents from a nozzle when a button is pressed; used for paint, cosmetics, lubricants, insecticide etc.

(humorous) A can of deodorant, typically used when there is no time for a real shower.

(Australia, colloquial) A toilet.

(chiefly US and Canada, idiomatic) An attempt or an opportunity.