I probably haven't heard it in roleplaying due to not reading enough /tg/ stories.
There was definite metagaming going on, but that was far far from the worst of it. It was That Guy and That Girl working together, just with MtG as the setting, and a bit of GM's girlfriend throne in, despite the lack of GM.
Hopefully it's on foolz.
"Do you Catan?" was a That Couple too.