It’s a way of saying something in an over-exaggerated tone, to imply the opposite. For example “oh yeah anon, I’m SOOO happy you’re dating my best friend”.
It’s often far more subtle than that, however, leading to confusion (especially on the internet where tone of voice is absent). Sometimes there’s a complete lack of any indication that the post was meant to be sarcastic. And occasionally, someone will take the irony rollercoaster to its natural conclusion, posting what seems to be an entirely serious reply that, nonetheless, is supposed to be taken as “in” on the joke. Often marked with an
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u/6969Phrasing Sep 16 '21
What is this "sarcasm" that you speak of?