From The Ryskind Sketchbook.
"Who's Isaiah Washington?" I asked. So Ryskind explains to me that some actor named Isaiah Washington got into an argument with a colleague on the set of their tv show and used the new "f"-word. And was outed for it on the Ellen DeGeneres show, denied it for awhile, then they caught him on tape using that word and he was going to be fired, so he admitted anger management problems and went to rehab.
So that's what Coulter was riffing on. Who knew?