Noun
English Wikipedia has an article on:party hornWikipedia
party puffer (plural party puffers)
A cylindrical blowing device that consists of a mouthpiece, which may or may not be a whistle, attached to a coiled tube of paper, given to guests and used at large celebrations especially New Year's Eve, or birthdays. When the mouthpiece is blown into, the paper tube unravels and a humorous festive noise is produced.