So according to this (thanks, @clacke), the best way to translate the Spanish "cuñao" into English is as "ultracrepidarianist".
https://en.wikipedia.org/wiki/Sutor,_ne_ultra_crepidam
#cuñáo #ultracrepidarianism #sutorneultracrepidam #zapateroatuszapatos
#cunao #ultracrepidarianism #sutorneultracrepidam #zapateroatuszapatos