George Stimpson

Geezer in the sense of a codger, a queer old duck or an "odd genius," is believed to be a dialectic corruption of guiser, which originally signified one in disguise and later a mummer, especially a Christian mummer. An odd, eccentric or queer person was called a guiser or geezer because he was fancied to resemble a person dressed up in outlandish costume like a scarecrow for a masque or mummer's parade.