knickerbocker glory · noun1
A genericized form of Knickerbocker Glory, attested from the 1930s.
Knickerbocker Glory · noun2
Uncertain. Possibly originated in reference to Knickerbocker as a generic term for New Yorkers or from the Knickerbocker Hotel in the city.
Etymology from Wiktionary, CC BY-SA 4.0.