The Horny Horn is a horn that, when blown, gives all bystanders an erection. It was created by Belinda Kenobi in her prostitute days, and later taken by Rose Cotton, who believed it temporarly took away the powers of aliens and wizards, whom she consider to be weirdoes. The aliens of wizards of Little Hillbillytown convinced themselves this is what the horn did, until over a millenium later when Slash Glorgson pointed out what it truly did. Rose still kept it, because, if blown for long enough, it will explode bystanders penises, killing them.
The Horny Horn has appeared in all four seasons of the show Weirdoes: