“Hooo! wooo! wooo! Be afraid Rove...” add verbrato between the ‘o’s.
hmmmm, verbrato. Would that be a pulsating verb? You do know what a portmanteau is right?
I think the term you were searching for is vibrato.
Okay, you asked for it. (sorry safari and IE users, this will not play for you...):
Hoo! woo! woo! Be afraid Rove...