Furon Nuclear Weapons were the most devastating weapons of the Furon race.
The Furons have waged war against inferior races for eons with nuclear weapons that were the "envy of the galaxy". They were also instrumental in ending their war with the Blisk.
But this atomic weaponry was also unregulated, and it mutated their genes as a result. It has wiped out their genitalia, making sure they could no longer reproduce. After the Furons exterminated the Blisk, these weapons were discontinued.