WLLR's Nearly Impossible Question

We're thinking of a word that was first used in the late 1800s as a term of mockery for young men who were overly concerned with keeping up with the latest fashions. What word is it?

Ans:  Dude (It later came to stand for clueless city folk (who go to dude ranches) before it morphed into our all-purpose laid-back label for a guy.)