Rosie, a hunter's bump is a little protruding spot at the top of a horses bum.
Some say it's caused by jumping, hence the name "hunter's" bump.
However, it's usually just a conformation flaw. Posted via Mobile Device
Oh, sorry I missed your question, rosie. I'm not quite sure if it's an American specific term or not. I haven't ever noticed any alternatives from other locales but there certainly could be. Posted via Mobile Device