An authoritarian self-proclaimed 'leftist' who loudly decries anything that's not 100% in-line with their desires as 'shitlib' policy that must be opposed even at the cost of ushering in actual fascism. This actual fascism is also often described by tankies as 'not that bad' or 'the exact same' as the 'shitlib' policies they oppose. Dissenters are inevitably reactionaries who must be (often literally) crushed, as they don't reflect the TRUE will of the people (ie whatever the opinion of the tankie is).