Headnod
The involuntary and repetitive head reflex one exercises when listening to a really tight jam (song). The individual bobs his/her head to the beat of the jam, exuding a feeling of confidence and coolness that quickly vanishes once the jam ends.
Once "Nothin' But A G Thing" came on the speakers, Maleeq's headnod intensified dramatically and the hos noticed his good vibe.
headnodic
adj: a beat or rhythm that is hypnotic to the point of making your head nod. Believed to be pioneered, but not created by, Pandora radio as an attribute of music, specifically in hip-hop, hip-hop instrumentals and trip-hop genres.
This beat is so headnodic that I was nodding the whole time without even realizing it.
headnodic
a quality of a musical beat which makes you unknowingly or uncontrolably nod your head to it.
"man that DJHERO daftpunk mix is headnodic,"