1 definition by Reps and creatine
an adjective used to describe a cyclist with a lack of knowledge and talent in the sport. These 'chummers' are usually persons trying to play with the big boys from lower ranks known as 'triathletes' or 'commuters'. Chummers are susceptible to: being ineptly slow, having less knowledge about the sport than Kerry Katona knows about parenting and owning a head as big as the hole Lance Armstrong left the sport in.
by Reps and creatine February 5, 2013