To destroy one's own culture, community, or nation.
"Pydi-" derives from the greek word "Paideia" which means culture or education while "-cide" means death in Greek.
"I'm NOT racist," screams the suicidal German Cop while he opens the borders to the Illegal Muslim Horde as they start trampling on him. Thus, starting the Pydicide of Germany as Millions of Germans allow themselves to be raped, desecrated, and killed just to avoid having themselves accused of being "racist."