Tizer (possibly short for "the appetiser") is a British carbonated soft drink. It's a sort of reddy-orange colour and has a sharp (not particularly fruity or sour) taste. In the 1980s it had an iconic packaging design - a red-tinted plastic bottle with a white label emblazoned with a red and orange version of the Pepsi 'yin-yang' mark, and the word 'Tizer' in navy text. Over the next twenty years it underwent increasingly edgy rebrandings, the most successful of which introduced the sublime Tizer Ice variety. More recently (as of 2007), Tizer has returned to a livery almost identical to it's traditional style, and has been reformulated to use fruit juice and no artificial ingredients (much to it's benefit).
In the 1980s there was a TV ad campaign for the drink starring (if I recall correctly) the Oblivion Boys (of Carling Black Label fame), in which they spoke a special Tizer language. This campaign spawned a humourous promotional flexidisc that was pressed on floppy orange seethru vinyl.