British colloquialism:

An affectionate form of address, usually used in a greeting and almost universally said by a man to another man.
Ah good to see you (optional insertion of person's name) old bean. How are you?
by Douglas MacIntyre June 19, 2007
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An Old Bean: A bean which has aged considerably since birth.
Used as a naming term for people when a posh english accent is put on by the addresser.
Good to see you, old bean.
Quit your jibber jabber, old bean!
by RowanDom June 2, 2010
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1)Referring to and or about an extremly elderly or a diabolically mishapen object or person 2) Aged part of any seedbearing plant in which the plant is unable produce offspring due to the elderlarity of the bean 3) Maniacs whom attack innocent villagers due to a loss of brain cells
The Old Bean was so elderly, and mentally insane, that he ravenged the poor children with his fluttering mustache.

Ex. the toad guy off of mario party, thor, possibly leviathan, nearly anyone with a raggity beard or 'stache
by Chris Podany March 25, 2008
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Term of endearment used by men when addressing an old friend, emphasising that you are pleased to see him.
It is absolutely neutral, and if anything a bit fuzzy warm.
Very Wodehousian.
Good to see you again, old bean!
Best of luck, old bean!
Still married to that gorgeous blonde, old bean?
by the shonny May 18, 2009
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Old Bean is the clitoritis of an older lady, usually a pensioner.
Gladys enjoyed flicking her old bean
by shaky hand man October 5, 2010
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A noun that can describe anyone either in an amicable, ironic or downright derogatory meaning.
"That's right, old bean!" - Amicable.
"STFU, you old bean." - Derogatory.
by AKX September 19, 2005
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