Spud gun legality before 1871, which would classify that model as an antique, spud guns are not subject to the eased regulations regarding antique weapons. Therefore any non-combusting spud gun with a maximum projectile energy of 7.5 joules can be owned by anyone without a license, while their manufacture still requires one. The legal possession of any other such weapon requires a gun license. A spud gun is not considered a firearm unless it fires a projectile faster than 152.4 meters per second and at a muzzle energy exceeding 5.7 Joules based on the definition of a firearm in the Canadian Criminal Code.
Back slang words spoken phonemically backwards. English frequently makes use of diphthongs, which is an issue for back slang since diphthongs cannot be reversed. The resulting fix slightly alters the traditional back slang. An example is "trousers" and its diphthong "ou", which is replaced with "wo" in the back slang version "reswort". Back slang is said to be used in prisons by inmates to make it harder for prison wardens to listen into prisoners' conversations and find out what they were talking about. This use of back slang was highlighted in the 9 June 2010 episode of "Crimewatch Roadshow". Back slang has