Noun
a middle-aged man with lecherous inclinations
Source: WordNetI've always thought that the stereotype of the dirty old man is really the creation of a dirty young man who wants the field to himself. Hugh Downs
;Grimbling :Voiced by Bill Oddie, Grimbling is a "dirty old man" who often appears as a groundsman, butler, or some similar profession. Source: Internet
There is a running joke in the programme that he is a dirty old man with a drink problem. Source: Internet