Meaning

• (dated in US) A male person.

• (chiefly Cockney) Someone affable but morally dubious; a wide boy.

• Term of address for a male.

  "Hi, geezer, you alright?"

• (sometimes mildly) An old person, usually a male, typically a cranky old man.

• Wife; old woman.

Meaning

• A boiling natural spring which throws forth at frequent intervals jets of water, mud etc., driven up by the expansive power of steam.

• An instantaneous, and often dangerous, hot water heater.

• A domestic water boiler.