It's whatever Egghead has with his partners.

While I see what you mean, if I do a little a contrario reasoning, I see what vanilla sex is ,too. But I'm not there in bed with other people.

It was a typo, the real word is “bardcore” which means that the player is so horny they want their bard character to sleep with every NPC the DM introduces.

It’s where two lovers pound some energy drinks, go at it like weasels, and shout “HELL YEAH!!! EXTREME!!!”

You stick a metal rod up the urethra and make the core of the penis "hard core".