The story
Blend of gal + Valentine's Day, originally the title and subject of the 16th episode of the second season of the American comedy television series Parks and Recreation, first broadcast in 2010.
Etymology from Wiktionary, CC BY-SA 4.0.
Galentine's Day
Today it means: An American cultural holiday on that celebrates women's friendship, around the time of Saint Valentine's Day, typically on February 13. Full definition →