What are tankies? What does sea-lioning mean?

https://lemmy.world/post/1470986

What are tankies? What does sea-lioning mean? - Lemmy.World

I’ve run across these terms several times, but without enough context to figure out what they mean. Could someone help me out, please? ETA All of you are amazing! A huge thank you to everyone who responded, and an extra thank you to those who have provided links or explanations to further and/or related information. I am learning so much by reading all of these comments!

“Sealioning” here refers to a way of trolling by asking ill-intended questions, usually disguising it in innocence. When other members try to explain and help, they’d try to lure them into hours of discussion upon it, usually by knowingly misinterpreting what they heard.

Or worse, just directly disrespect and reject all the suggestions the commenters provided. The essence is being a waste of time for everyone.

Is this the same as “concern trolling”?
It’s related but it differs on the form. Concern trolling is derailing online discussions and debates by simulating concern over a seemingly valid counterpoint, making all participants waste time and effort arguing a previously settled matter, or pretending to just be playing devil’s advocate. Acting as if, although you support the cause or discussion at hand, you somehow still have some valid concerns to oppose.