High End jargon; your take

I've been around here for a good while now and read these terms frequently. Looked at some of the audio glossaries on the net. I still don't feel I have a good handle on their meaning. What do these terms mean to you?

"Tight" as in "the bass became more tight."

"Hi Fi" as in "it sounds "hi fi" (as opposed to high end)

"Warm" as in "warm bass."

Thanks