It is! He'll curse when he's angry, or worried, or when he gets impatient. One morning, I was preparing his food in the kitchen, Cosmo was calling from his cage (as he always does) "Riiick, fresh water" which means water and/or food (oh, he draws out my name Riiick, when he wants immediate attention). I guess I took too long because right after I put the bowl in the bowl holder, he looked at me and called me a "fu**ing ass". I still have no idea where he got that kind of language from, seriously! He may have heard it from a cable channel movie, as far as I can figure. Greys are certainly in a breed of their own!
~Rick