In a general, non-technical sense, "head bobbers" describes people who are so tired that they repeatedly nod off while sitting up — their head dips forward or sideways, then snaps back up.
Often called "head bobbers" or "head boppers," these are festive headbands featuring two springs topped with decorative items like stars, hearts, pom-poms, or shamrocks. head bobbers
It often describes concert-goers who stay relatively still—perhaps sitting on a barstool or standing at the back—engaging with the music through "head dancing" rather than full-body movement. In a general, non-technical sense, "head bobbers" describes