n. Hateful Old Hikers Association. "HOHA members hate mountain bicyclists with a fervor exceeding that of rabid wolverines."
From the Dictionary of Mountain Bike Slang
Probably originated in Vancouver, British Columbia, Canada on the north shore bike trails. Most of the original trails were built by hikers for hikers, except that there were very few hikers to use them and they made good singletrack. Soon they were being used by mountain bikers much to the dismay of the HOHAs.