Based on your answer, I've discovered what tankie means: Tankie = Marxist.
Successful Marxist movement results in a dictatorship of the proletariat. Dictator = tankie.
Hence tankie is a term used to describe any Marxist.
Thanks for contributing to this scientific breakthrough!
The point of federation is we don't have to go to other instances to see there posts. I'm commenting from hexbear all, not the Lemmy meme community.