You must be really old. Alfred Stieglitz and group of photographers championed a style of photography based on narrow DoF and out of focus back ground areas back in the thirties. He was of course countered by Ansel Adams and the the magazine he championed based on shooting at ƒ64. with large format cameras. Bokeh is just an update of Stieglitz's championed form, which was itself deprived from a school of thought in the world of painters that held that the subject should be painted with more detail than the back ground. Bokeh is a Japanese term, that if memory serves me well had to do with images with single point light sources in the back ground and really has little to do with this thread.
Technically bokeh images look like this.
Or this
Or this
We have so few actual bokeh images taken and posted the threads tend to get taken over by philistines such as myself.