The Book Whisperer in Teacher Magazine talks about "fake readers" in her post Fake It 'Til You Make It. She talks about fake reading as a coping skill used by students who have trouble with reading comprehension.
However, I've known excellent readers who did the first type of fake reading she talks about while in college. We're talking Dean's List students.
Not that I read every word of every assigned text while I was a student. I just wasn't that good at covering up.