gee ‧ zer /ˈɡiːzə $ -ər/ BrE AmE noun [countable] informal
[ Date: 1800-1900 ; Origin: Probably from Scottish English guiser 'person dressed in something that hides who they are' , from English guise ]
1 . British English a man:
I know this geezer.
2 . American English an old man