What does tankie really mean at this point?

I keep seeing "fuck tankies" everywhere, and seem to see people getting called "tankie" for any number of things--I used to feel like I knew what it meant (the formal definition, which I thought was the only application) but that's clearly not the case anymore. Saw someone get called one because they... Liked the idea of universal basic income and wanted walkable cities? And now the same sentiment is on a large number of Lemmy communities, lol.

I feel like I've been living under a rock.

Edit: Wow, I guess it's just as meaningless of a term now as it seemed. At least it's a nice, bright flag for ghouls not worth engaging with meaningfully, lol. I saw "fuck tankies" on a genderqueer community and got pretty confused on how the two ideas correlated in the slightest, so I guess that was the tipping point on me finally asking about it.