Breaking the fourth wall is from theatre, where you can imagine an invisible wall between the characters and the audience. Nowadays it’s used for any medium-awareness shenanigans including stuff like this, even though the audience (you) is not directly involved.
For some reason I find it weird that Shrek coincided with CRTs. Not sure if it’s because I tend to think of Shrek as being more recent than he is, or that I think CRTs stopped being used earlier…