It's more like "someone who's talking behind your back", quite literally, because "Fotzn" is just Bavarian dialect for "mouth" that has really nothing to do with female genitalia. I also don't think it's hugely offensive and a lot of people use the term Fotzn in various ways pretty casually in Bavaria and Austria.

That said, it's still a pretty weird thing to say for a teacher though, that's for sure.

That's why it's perfect for families that like to grow things, duh.

In a similar vein, for a moment there I was confused if this was a weirdly worded post about Unai Emery until I saw Emre Can in the thumbnail.

You know who it was? A bunch of fucking amateurs. They send him a finger and he's supposed to shit himself with fear. These fucking amateurs...