I honestly don't think you need a macro for a fury warrior. It is pretty simple as is, WW, BT, and wait for Bloodsurge to proc for an instant slam. Other than that, dump rage with heroic strike or cleave. If no one else is doing it, Sunder Armor is almost always a DPS increase as well, so you can dump initial rage on that, and then just make sure the stack stays throughout the fight.
If you must have a macro, this can be of some help:
It basically makes it so if you accidentally hit Slam without a proc it will cancel it, and if a proc is up then your instant slam will cast successfully.