Just... Why? What just happened?

So, I just had the weirdest encounter in Sea of Thieves. A Brig managed to sneak up on me while I was digging up treasure on a gold Hoarders map.

They rolled up and shot two scatter shots in my ship while I'm trying to desperately sprint back to at least try to fight even if in vein, when one of the crew mates just shout over megaphone "Skibidi fuck yeah!" And then proceeded to detonate an Athena keg on their own ship and sank.

I'm just.... Completely dumbfounded. Just why? What was the goal here? I'm not even sure if this just actually happened or if I'm hallucinating. I mean, definitely something different I'm just confused what the end goal was here.