What does 'Blah Blah Woof Woof' mean?

Its like a 'yada yada yada' or 'etcetera'.

I found this on a blog (thechannelocho.blogspot.com/2007_10_01_archive.html):

"When I reach the saturation point an expressed though, there's nothing more to say besides "blah blah, woof woof". So was taught to me in the Summer of Love, 1967...in the morning at Woodstock when Jimi Hendrix took to the Stage. He started talking to the crowd but then trailed off "blah blah, woof woof" twice during his intro to the song "Isabella"."