Dead Head is a name given to fans of the American jam band, the Grateful Dead. In the 1970s, a number of fans began travelling to see the band in as many shows or festival venues as they could. With large numbers of people thus attending strings of shows, a community developed.
Deadheading is snipping off spent blossoms before seeds form so that flowers rebloom. For me it is a restful activity and one of the best parts of gardening. I have a favorite guide that Garden Gate published a few years ago that you might enjoy.
Right now many flowers are through their first bloom and ready to deadhead. With good timing you might be able to enjoy a second round of blossoms before snow hits.