A pitifully slow cyclist commuting in London. Usually seen decked out in a useless high-vis Altura Night vision jacket with matching fluro hump backpack cover. Often seen woefully weak lights that are reminiscent of a sickly glow worm, but its quite common for them to have none at all. They will clog up the roads in the every summer leading to the so called 'Noddergeddon'. They will barge in front of you at the lights only to set off like wobbly slow grandma forcing you to drop them instantaneously, at the next set of light they'll do the exact same thing again causing incredulous cry of frustration to be emitted by every other cyclist around them.
The term its self comes from their habit of nodding their heads up and down whilst they struggling along in the wrong gear often with a bike that's totally the wrong size for them. It was coined by a user of London's famous LFGSS cycling community.
"Jesus Christ the roads are clogged with nodders today, I didn't realize that Noddergeddon had started already!"