Shhh, it's our little secret!

At lunch today, I got asked to go to dinner with my Vice Principal! He told me, "Sshh, it's our secret!" I thought it was hilarious, because typically that phrase is used in more than shady situations. In acuality, it was completely innocent... He's 60 years old and I'm going to dinner with his family and my co-teacher. He said, "Ssssh, it's our secret" because he didn't want the other teachers to be jealous that he was taking me to dinner, but I love when Koreans say stuff that has really sexual or vulgar connotations! It's hilarious!