A euphemism for the male sexual organ. Derived from the 1974 movie "2069: A Sex Odyssey", which is the first result on the internet movie database IMDB.com when a search is performed for "Gideon's Trumpet". As a euphemism, this phrase has no connection to the book of the same name by Anthony Lewis or the movie based on the book.
She enthusiastically blew Gideon's Trumpet.
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