"Tinnie" is the common term for a commemorative medal made from a non-precious metal such as zinc or tin (or even plastic) and with provisions for being attached to a garment and displayed while worn. Such medals were commonly sold or given away at public events to build group cohesiveness or to lend prestige to the wearer. The "golden age of the tinnie" was World War Two, and the Nazi Party and the USSR were among the most prolific disbursers of them. They are avidly collected today by hobbyists and, although usually inexpensive to obtain, are often collected in conjunction with coins, exonumia, military awards and decorations and other related small stamped or cast metal objects. 
In New Zealand, a "tinny" or "tinnie" can be a small package of cannabis wrapped in tin foil (cf. 'foilies' in Australia), retailing for between NZ$20–25 (depending on the region). A building where such retailing takes place (commonly a superficially unremarkable home) is a "tinnie house". Other drugs such as methamphetamine may be available as well. In recent years the term has become not unusual in New Zealand court judgments involving the Misuse of Drugs Act.
Another variant of "tinny"/"tinnie" is as a slang term for a can of beer, commonly used in Australia, New Zealand and some parts of the UK. Most items referred to in this region as "tinnies" are actually now made of aluminium.
In Australia and New Zealand "tinny" is also commonly used as slang for a small open aluminium boat.
Short for tin-arse, "tinny" is also used in Australia to mean "lucky", as in "he's a tinny bastard". The term "tin-arse" and sometimes "tin-bum" are in common use in New Zealand.
Tingoora, a small town just north of Kingaroy in south-east Queensland, Australia, is also often referred to a "Tinny", e.g. the "Tinny Pub".
In the United States, a "tinnie" refers to a piece of tin foil that is made into a smoking device, most often for cannabis. It is used when nothing else of use can be found.
Other uses cover certain German medals or shops selling aluminium products.
"Tinnie" in Australian slang also means a good mate and a good friend.
One of the medieval Peel towers on the Scottish Borders was at Tinnies.
Colloquially meaning a game in which a group of people jump on top of each other to form a pile, like sardines in a tin. The game is initiated by an individual shouting "Tinnies", then lying face down to allow other players to lie on top, forming the pile. This game is also known by the names "Bundle" or "Pile-on."
"Tinny" is also a term for audio which lacks resonance, resembling a piece of tin being struck.
The phrase is also referenced in the Monty Python sketch "Woody and Tinny Words" where Graham Chapman describes various seemingly-random words as being "tinny" or "woody" with the former utterance inducing great discomfort in his daughter.
In the town of Bathgate, West Lothian, "Tinnie" often refers to an aluminium can of Tennent's Lager. "Here Oj, gies a tinnie o'er mate".
- Tiffen, Rachel (6 February 2010). "Drug crackdown nets more than 250 suspects so far". The New Zealand Herald. Retrieved 6 February 2010.
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