to me a Chopper "Chop" is any bike be it HD - thru to Jap 4banger that has been CHOPPED i.e. cut up and hard tailed in a garage - hence the term Chopper/Chop, they aint nessacarily pretty like the Discovery Channel/OCC would have you believe, in most cases they were built to keep a bike going and majority of early HD's were Hard tail anyway with a sprung seat
here are a few bikes i would call chopper
here are a few bikes i would call chopper