The correct wording/grammar is....
That's an arm.
Can't you even get a 3 word sentence correct, fucking moron.
Good call, ether. Came on to make the same point; good to see someone caught it. I'm not always a grammar Nazi, but when some tool - and not just any tool, but the Uber-tool himself, DA - starts a thread using such a mangled bunch of words, it 'diminishes us all.' If you're lurking, Uber-tool, this child-like grasp of the English language belies your claims to any higher education. Go get yourself a junior primer and then try again. Thanks for playing though.
/cue da's retort noting his house, cars and lavish lifestyle in 4,3,2...