I've seen this Слоган on a lot of HP merchandise...what does ''Draco Dormiens Nunquam Titilandus'' mean?? Did they say it somewhere in a book and I missed it? Because I'm stumped...

it's Hogwarts motto. Ты can see it with the emblem of Hogwarts in the Книги right under the picture of badger, lion, snake, and raven,
it mean don not bother Draco when he is sleeping >:C LOL j/k... it mean do not tickle the sleeping dragon.

I think it means "Don't tickle the sleeping dragon" или something like that... I may be wrong.

It means Never tickle a sleeping dragon

Have Ты read the Книги ? This is the Hogwarts Слоган !

It means "Don't tickle a sleeping dragon", the equivalent of the Muggle saying "Let sleeping Собаки lie".

Draco: Dragon
Durmiens: (it) is sleeping
Nunquam: Do not/Never
Titilandus: (you) tickles, imperative

The dragon is sleeping, tickle it not.

Do not tickle the sleeping dragon.

Can be seen as a bit of foreshadowing, seeing as how Voldemort decided to take on the sleeping dragon that is Hogwarts School of Witchcraft and Wizardry.

It means "never tickle a sleeping dragon." I saw it and the translation on a robotic Norbert.