Answer:

If you are an addict, you know what it is.  In the beginning, when you started dancing, these seemed to be easier to come by.  Every night you would to be an able to get a "fix".  You would be satiated.  Now, after years of dancing, you are lucky to get your fix once a week.  Sound familiar? Many people actually have equated the elusive salsa high with drugs . The more you seem to take, the more you seem to need in order to reach your old "highs".  It might be a single dance, a series of dances, whatever, but it just transports you and makes you feel great.  It is almost dreamlike.  At the end of the dance, you just sit back and say "wow", it is magic. So what is it? It is that feeling of dancing on air, and being one with the music.  Where every move you and your partner make are in sync, and play off of each other.  When you are in the groove (the same groove as your partner), and you both just fly to the music.  Super fast and sharp or snail slow and graceful, it does not matter.  It is that one dance that can make your entire night.