The Chambers dictionary is noted for containing some definitions that are less than completely serious. These are the ones that I found were also actually amusing (in a rather reserved, lexicographer kind of way):
(slang) the professional loggorhoea of many politicians, officials, and salespeople, characterized by prolix abstract circumlocution and/or a profusion of abstruse technical terminology, used as a means of persuasion, pacification, or obfuscation.
usually an excuse for not allowing it to get abroad.
a cake, long in shape but short in duration...
a careless pedestrian whom motorists are expected to avoid running down.
between youth and old-age, variously reckoned to suit the reckoner.
(colloq) a gathering for the purpose of amorous caressing as an organized sport. Origin unknown; not from Gaelic