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a quality of a musical beat which makes you unknowingly or uncontrolably nod your head to it.
"man that DJHERO daftpunk mix is headnodic,"
headnodic by PhatRhymeSayR March 14, 2010
Related Words
To "headdick" someone means to surprisingly put your penis on a friends forehead and slap him several times in order to punish him for making a mistake/ doing something the wrong way.
while Steve was sleeping, Brian headdicked him like a bauss!
Bring me that money you owe me or I will headdick you hard
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.
Headnod by Snocap September 20, 2006

Crack headdict 

When you can’t decide whether someone is a crack head or a crack addict
Yo a crack headdict tried to bite my dick off a seven eleven yesterday