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1.
In the U.K.: A guy, a bloke, a person in general. The British equivalent of the American slang word "dude".

In the U.S.: An old man, particularly one who is either cranky or eccentric. Rather derogatory term.
(UK) "You're looking for Johnny? Yeah, he's that geezer over there in the green coat."

(US) "Old man Anderson keeps yelling at the kids playing outside. That geezer!"
by Bill M. September 20, 2004
 
2.
A Geezer is a male englishman who likes drinking, football, and violence, preferably all at the same time. Wants to be the typical cockney jack the lad. They dress up smart to normally pull 'birds' favourites being Stone Island and Burberry. Theyre basically like a better meaner version of a Chav and not bad people to know aslong as you just prove your a 'geezer'. Sorted me ol' mucker...
watch the film 'Lockstock and Two Smoking barrels'
by Neil January 08, 2005
 
3.
1. British definition: A geezer is a bloke, a man or a "dude".

2. USA definition: Old bastard. Elderly, cranky old son of a motherfucker who drives too damn slow and complains about how things were in his day

3. Heavy Metal definition: Black Sabbath's bass player, Geezer Butler.
1. "Ere mush, who's that geezer at the bar?"
2. "Move your car out of the road, you old geezer or I'll break your hip!"
3. "Geezer Butler is a cool bass player!"
by IRON MAN January 29, 2005
 
4.
John McCain
There's no way such a geezer can lead this country.
by Phylosophi October 11, 2008
 
5.
An English bloke with a shaved head that wears jeans and shirts all day everyday. Has a good old piss up down the local pub, has a kebab or curry, then goes home. Works in manual labour job, builder, scaffolding, plumber and is generally a good bloke, as long as you support his football team.
Geezer 1: wanna go down pub?

Geezer 2: no mate gonna go down the chippy first.

Geezer 1: fuckin sorted mate.
by Shrike93 June 11, 2010
 
6.
Old People, usually drive extremely slow.
Walk into a Nursing Home and you get thrusted upon geezers
by cat g October 13, 2007
 
7.
The word given to a cockney male (East Londoner). A typical geezer is a man who dabbles in a bit of illegit business. Also with possible links to organised crime. Generally of white skin colour. Most likely place to see them is at a pub talking business with other geezers, they love a pint.
by JayeSBeCockney March 13, 2011