Here I thought it was shorthand for ‘someone who doesn’t understand Bitcoin.’ 

 Yes!!! Even better, "someone who doesn't understand cryptography" 

 #makecryptocryptographyagain 

 I seem to recall that Erik's book describes the origin of 'crypto' as being the ancient Greek for 'hidden'.

So 'crypto' means 'hidden' and 'cryptography' means something like 'hidden writing'. 

 That's right! Yeah so cryptocurrency is not the best name...but it stuck. 

 This