O1G - Orbán Egy Geci. Roughly translates to "Orbán is a motherfucker".
This was first used in 2015 by businessman and ex-fidesz oligarch Lajos Simicska when he clashed with his old time friend, PM of Hungary, Viktor Orbán.
It became popular again in 2018, becoming the symbol of the public protests against the Viktor Orbán and his leading government. In late 2018, it found its way in international politics and now is used by several, non-Hungarian politicians and meme pages.
"- Have you heard that they really signed the slave-law?
- O1G"