From the way everyone is talking I think 'geezer' in the USA is an old gentleman?

In the UK it's a bit of fly by night quick dealer:
from the urban dictionary:

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'

qjs