It's decades old. Refers to people who support communist regimes regardless of what they do. Originally because the Soviet Union used tanks to quell rebellion and some people in the west still cheered for them.
I believe it was coined by the British left when the USSR quashed the Hungarian revolution by driving tanks through their streets. Anyone still in support of them is deemed a "tankie." Nowadays it was meant to criticize authoritarian communists.
I apologize I'm only up to 's' in my quest to memoriz3 every fucking word ever used in the English language. 🙄 The fuckin word, "meme" is like a million years old. It doesn't mean it was as regularly used in conversation before social media. On a different note, for how many other languages use Lemy how would you know English is my primary language?