So far this is the earliest reference to SashaMutt I can find ....
Happens just after you joined as Paradise Lost. Just after the banning of Mind Ltd. Pre-Care-Less, IIRC.

So, if I didn't invent it, I took ownership more than SIX years ago. Still it sounds like me .... The Sasha shtick, the dog pic of Mind Ltd and my liking to say "Bad" to animals.