I get what you are saying, but I didn't know of it is the short attention span of today's youth, the internet or what, but slang seems to come and go much faster, and with new meanings to words, or made up words. My wife tried to say out was the same thing as "gag me with a spoon" from our youth, but I disagree.
As for the first part, I'd say you're using it wrong and saying that would look pretty lame. The whole response is "merch" by itself, not using it in a more complete phrase, which adds to the stupidity.