Geezer is a British slang term, in its simplest form meaning a man.Derived from the differently pronounced 'guiser', a name for an actor in a mime. http://www.allwords.com/word-geezer.html Possibly related to disguise. In this sense it refers to a kind of everyman.It may be used in a number of senses; to refer to a man whose name you do not know, similar to use of the word guy. It is also used to refer to a man who is overtly manly, masculine, or heterosexual, also someone noticeably capable,