headbob/headbop [hed-bawb/hed-bawp]
verb
1. To bob or bop one's head to the music.
EX. I dunno what's better in this picture-- the fact that this individual owns four pugs and had the wherewithal to dress them up as the Marvel's ultimate team of heroes or the fact that they're headbobbing to the themesong of the Super Mario Bros. Super Show!