@Felthry it's a term from computer graphics
For historical reasons, some video games used collision detection optimizations with identical logic and hardware acceleration as the occlusion test. As a result, non-specialists have incorrectly used the term "clip" (and its antonym "noclipping") to refer to collision detection.
https://en.wikipedia.org/wiki/Clipping_(computer_graphics)
@noiob yeah that sounds like someone being pedantic about terminology and insisting that language shouldn't change
@Felthry I'd take that quote with a few grains of salt though, since I wouldn't call the Doom devs "non-specialists", I think the "noclip" cheat really popularized the term