1. An antiquated relic of the complex
grammar of the English language which is quickly fading from usage due to the
ever ongoing simplification of language in actual use. In older usage, the object form of the pronoun "who".
2. A symbol of pomp, used as a feeble attempt to show superior intellect and social status.
A: "You'll never guess who I'm taking to prom!"
B: "
Don't you
mean 'whom' you're taking to prom?"
A: "This is why you still
don't have a date."