Because you can't spell odour

(bogus official shove it up your cunt, Tue 12 May 2009, 8:33, archived)

..
This is true. But this may be more due to the fact that for some reason, the dictionary on this firefox install is set to use English (US) rather than a cause of bad smells.
(oeb, Tue 12 May 2009, 8:36, archived)