Green’s Dictionary of Slang

William Tell n.

[rhy. sl.; ult. the 15C Swiss hero William Tell]

1. (Aus.) hell.

[Aus]Sun. Times (Perth) 5 Sept. 8: I ’opped over ther parapet, and bogged inter ther cows, yer orter see ’em goin’ like William Tell.

2. a smell.

[UK]R. Puxley Cockney Rabbit.
[UK]M. Coles Bible in Cockney 127: William Tell – smell.