I don't know, Geoff. There is a term détaché in which notes are articulated by lifting the bow, sometimes quickly, off the string. The type of articulation you've described is probably a type of détaché bowing, but with more vigor. I think I've seen the term--and I think it's Italian. I emailed my daughter--who sleeps late Sundays!--but she should respond by evening. She'll know the term if nobody else comes up with it here.

Bow regards,
Wordwondering....

Brainstorm! I'll post your question on Maestronet.com! They know EVERYTHING there (well, just about) about strings.