I've just heard it called MTV-style or rapid cutting. The older style of montage was called (perhaps still is) vorkapich after its inventor Slavko Vorkapich, who worked in Hollywood and taught at USC Film School. The article on montage at Wikipedia has a cross reference to hip hop montage, but I'm not sure that that's what you mean either.

http://en.wikipedia.org/wiki/Slavko_Vorkapich
http://en.wikipedia.org/wiki/Montage

[Fixed spooneristic eponymous proper noun.]

Ceci n'est pas un seing.