When an individual Manages to get there finger caught between there bicycles chain and there chainring/cog. pinching the finger resulting in separating the skin from the nail. this injury is common amongst Bicycle Mechanics and cyclist who carelessly try to fix or tension there chains.
i pulled "AJon" while greasing my chain. that shit still hurts
hey ajon whats up girl
or short form "hey jon"
ajon, jon, jonny, jonny boy