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"Chopped" or "Chopper" go way back and essentially mean the chopping of 'as bought' or factory parts in favor of customized taste to the individual. One of the common things you see are extended forks and various style of bars but it also has to do with the removal of turn signals, passenger seats, etc. and whatever else. A general term, in other words.
I like the photos, too, very nicely done. Thanks for sharing!
Actually, you just described a bobber.
Chopper means that the frame has been modified by cutting off the steering stem, and repositioning it to change the bikes stretch, fork rake, etc. Before aftermarket frames the only way to do this was to cut / "chop" the frame.