WWND
It means the Atheist twist on the common WWJD (What would Jesus Do?) The abbreviation of "What Would Nietzsche Do?" This refers to Friedrich Nietzsche (Pronounces " Knee - Che") an atheist German Philospher who wrote many things on politics & Religion but with other topics. One of his famous quotes is, " Faith means not wanting to know what is true."
Christian: "Oh my God, Is He Dead!?! What should we do!? WWJD?"
Atheist: " Oh my peaches! I have no idea! WWND?"
Christian: "WTF?"