The correct command is:
/bind x +taunt
Replace X with the key you want the taunt to be bound to, I have mine on O. You may be able to set it to one of the F# keys but you'll have to figure out the right code for it. For example I think for page down it's pgdn or something.
Clarionet, n. An instrument of torture operated by a person with cotton in his ears. There are two instruments that are worse than a clarionet -- two clarionets.