It means"that is porn" or pornography, in "rapper language" .I think maybe she is hiding stuff on her phone she doesn't want her parents to see because it is not appropriate.

An alternative is that in that folder there are a lot of pictures of someone called "Datiz". Like with terms "food porn", "car porn", it doesn't necessarily mean it's a folder of pornographic images, it can be just photos one looks at with the same attraction and compulsiveness that are usually associated with porn. Images of 'Javier Datiz' for example.

Also inappropriate

doesn't really mean anything in english, just a made up word