Normally, the nod would mean to accept or OK. But for the people of Bulgaria, and green panes with a reputation for answering or rejecting a phitphaek from other countries. A nod up and down is the negative.
Normally, a nod to mean acceptance or agreement. But for Bulgarians and Greeks are famous for the acceptance or rejection of a divergence from other countries. The nod up and down to be significantly negative.
Usually nod is meant to accept or agree. But for the Bulgarian and Greek is famous in response or denial to differ from overseas. Nod up and down will be negative.