When too much technical detail is jammed to a single Powerpoint slide, making the task of presenting or understanding them next to impossible.
Slide rape use in prevalent among inexperienced presenters, although the phenomenon is gradually becoming a universal feature of any Powerpoint presentation. Anyone also trying to make the audience confused in order to avoid difficult questions at the end, or make themselves seem more intelligent may appeal to slide rape.
The technique is also known as slide-gang bang, is somewhat similar in nature to sentence rape often used by novice English writers.
Bob: "Dude, did you attend the presentation on beam quality and collimator design?"
Chris: "It confused the heck out of me. Why did the idiot have to put so many figures and text in a single slide?"
Bob: "Classic slide rape!"