Gaga Horns Share definition Flag When a person is so bony that the front part of their shoulder blade pops out a bit, looking like the weird horns worn by lady gaga are growing. Dude, Cheryl hasn't hit the gym in so long she is growing a set of Gaga Horns. Gaga Horns by Socially Awkward19 April 30, 2011 Get the Gaga Horns mug.