we we all know ulfric shouted the highking to death but any one know what shout it was, as in did he FUS him?

We don't know what shout it was but the Thu'um stroke Toryg to the ground and Ulfrics blade pierced his heart. Unrelenting Force is one of the Thu'ums which may fit in the picture.

I assumed it was FUS RO DAH because no other Shout really fits the description. It's possible that the shout itself caught Torygg offguard so that he fell to the ground, but it seems like there'd be other details of its effect to suggest Disarm or another such shout. Also Unrelenting Force is the first shout taught to you by the Greybeards, and in this one journal in this old draugr crypt from the First Era remarks that they broke through the wall with the help of a "young Voice master." So that evidence makes it seem like Unrelenting Force is a relatively basic shout since a young Voice user used it, and Ulfric studied with the Greybeards before going to fight in the Great War, which was over 30 years ago.

Unrelenting Force is the only shout that I've seen Ulfric use. I spawned him for some NPC battles and never saw another shout.

Probably Fus Ro Dah. He used it on me when I took Windhelm. I staggered a bit, then used it back on him- blew him the length of the hall (along with Tullius, who wasn't happy about it. Oops).

LOL, well Tullius deserved it

The only shout that I have seen Ulfric use has been the Unrelenting force (which I saw him use when we took Solitude)