How should I tell this to my friend and how do I hide it from my other school friends?

Huh?

You could try telling him that it was a personal joke between you and your other friend. Just talk to him about it and hope he doesn’t mention it to anyone else.

Oh my God.

Relegate your super personal conversations to private messages only, from here on out.

First, calm down.
Second, if you put your cursor over any comment in a thread on Facebook, an “X” should appear to the right of it. Click on the “X” to delete any unwanted comments.
Third, use the message system on FB in the future for private conversations. Don’t write personal things on somebody’s wall. Anything written on the wall is visible to any of your friends.

@Vincent_Lloyd I lost you at the 92nd ‘friend’.

Stay off Facebook, you just learned the hard way that nothing is private on that site.

You could go back and delete what you posted. Check your privacy settings, and from here on out, watch what you post. A good rule for social media is to never post things you couldn’t explain to your mother.

Oh? Before editing, your question was pretty much unintelligible, hence the “huh?”

To give you a helpful answer now, I’d say don’t worry about it. It may seem embarrassing now, but in a few years you’ll discover that people talk about sexual things all the time and most people don’t care about anyone’s sexual exploits, kinks, or oddities. And it’ll be just one of many things that you’ve talked about…

if you don’t want anyone else to know….delete all the comments that you posted and he posted that you don’t want people to see.