Its similar used as the Finnish phrase torilla tavataan!, Bojler eladó! is usually spammed under posts which has any connection to Hungary or Hungarians. Bojler eladó!
literally translates to 'Boiler for sale!', and it's frequently used whenever Hungary is mentioned to denote that the person used
said phrase is a Hungarian.
Bojler eladó! has lost its
real meaning, as ad for selling a boiler, it only acts as an expression to signal that the user is Hungarian.