From the french expression : "anguille sous roche" that tell : "There is a snake in the grass."
But the second metaphore that tell there is Rocco like "Rocco Sifreddi" referred to the italian pornstar.
So the meaning explain that there is something hidden about a sexual thing.
Tom : I met a really cool girl last night,, he was pretty handsome, we chat all night long !
Chloé : Shhhhhhh , don't tell me that ! I know there is a anguille sous rocco heheheh
Tom : Please no comment ahahaah you embarassed me !
angillo is cute, handsome, unbelievably charming and wholesome. He has a cutest smile anyone can see. He is someone that every girl wants to have. Popular and very social. Also a great love maker and kisser. angillo is loved by everyone he knows. Also he is very athletic and humble. He gets hurt easily because he has a tender heart