Old nic-name for a New Yorker. Comes from the days when it was New Amsterdam and the ruling Dutch wore knickers for pants. Since these were so commonly seen on the streets there, the name was then applied to the residents. Source of New York Knicks basketball team name as well.
A Knickerbocker Glory was, when I was a kid in England, a sort of ice cream that came in a long glass. I´m not sure what sort of ice cream was in it, but there was whipped cream and sauce on top. And a wafer
When a lady with a blue waffle and a gentleman with the male equivalent engage in sexual intercourse the resulting mess is called a Knickerbocker Gory likened to the desert due to the varying textures and liquid viscosity left over afterwards. From thick wart drippings to the crusty flakes of genital skin this is one pudding you won't want to sink your teeth into.