1) Slang for a can of beer 
The slang or colloquial term tinnie or tinny has a variety of meanings, generally derived from some association with the metal tin, or aluminium foil which has a loose allusion to tin. `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 .....
Tinnie is Australian slang for a can of beer.