geezer

n. old man; eccentric

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. 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, reliable, plainspeaking or down-to-earth. Although essentially a masculine quality it is not synonymous with macho however, and its usage may be thought of as very similar to that of the US English word dude. Example:  Joe Cole referred to Prince William as a "nice, relaxed geezer." In the British 1971 pop song by the Piglets, aka Jonathon King, 'Johnny Reggae' was described as being "a real tasty geezer".
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Noun
1. a man who is (usually) old and/or eccentric
(synonym) bloke
(hypernym) man, adult male
(classification) colloquialism

old man, old person, old coot On one street there was an old geezer begging for money.

Synonyms and related words:
Father Time, Methuselah, Nestor, Old Paar, centenarian, dotard, elder, gaffer, golden-ager, gramps, grandfather, grandsire, graybeard, nonagenarian, octogenarian, old chap, old codger, old dog, old duffer, old geezer, old gent, old gentleman, old man, old party, old-timer, older, oldster, pantaloon, patriarch, presbyter, senior citizen, septuagenarian, sexagenarian, the quiet-voiced elders, venerable sir, veteran