"Don't tell Mom about Toast" is an internet stalk, which originated from a funny scene in a Japanese variety show. The core of this stalk is that children enjoy a particularly delicious food (usually toast) at school or on other occasions, but in order to make themselves special, children want to preserve the exclusivity and mystery of this kind of food, so they will say "Don't tell mom". This stalk has been widely spread and imitated on the internet, and it has become an expression used to describe the way of reservation, confidentiality or special enjoyment. When people use "don't tell mom about toast" on the Internet, it usually means keeping something secret, enjoying some special treatment or having a special understanding of a secret.