To "get high" off of something means to feel especially good after doing something. That something might be
algebra, some kind of drug, or perhaps a really good book. The high off of illegal
drugs, though, is synthetic and is NOT a good high, as it brings your mood
straight down after you get this high.
You might laugh at the slightest thing or feel free of worry. It depends on the individual, really.
Person 1: "Yo, do you want to get high off this new thing."
Person 2: "No, I'm not crazy like that. I get high off of good
things that
don't bring me down. Here's an
awesome book." -hands person 1 a book-