A derogatory term for a large group of inept northerrn UK mountain bikers, the sort who need to pad up to ride off a kerb, and get off and push up it. While this could be covered by the term "all the gear no idea", the important distinction is the sheer number of these bikers-cum-walkers gathered together in one place blocking the trail for
people who can actually ride and making the
case for more relaxed
gun laws in the UK.
See also singletrackworld.