I think that's an Aussie saying for someone doing some unmentionable (and anatomically impossible) thing to themselves.
But at any rate, to get this back on topic. Lest one has been in the depths of deep depression, they shouldn't judge anyone who has. And as someone who's been in some deep dark places, it does indeed suck, and I feel for Robin's family, friends, and fans. Believe me, suicide does sound like an option, because of how much emotional pain one is feeling, since it feels like no amount of medicine can take away that pain. And combine that with the fact that he was in the early stages of Parkinson's, which in and of itself is a devastating disease, I can only imagine how bad he felt, physically, mentally, and emotionally. Instead of calling him a coward, I'll just remember him for who he was... a comic genius who made millions laugh, gave more than he took, and was an awesome human being by giving his time to the USO, St. Jude's, and other organizations.