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-
me: oh my god, give me food
?: dude, here
hands me a bologna slice and some chocolate syrup and i eat it.
me: this is like sex.
?: i know
i continue to eat corn flakes(5 bowls) with stawberry milk and banana slices in it. high
? eats like i dont know how many ramen packets
me: i love you, this is soooo good
Getting laid here! Also getting shot at! NIGGERNIGGERNIGGER NIGGER NIGGER NIGGER NIGGER NIGGER NIGGER NIGGER NIGGER NIGGER NIGGER NIGGER NIGGER NIGGER JEWS FAGGOTS AND NIGGERS GET GASSED AND HITLER DID NOTHING WRONG! NIGGER NIGGER NIGGER NIGGER NIGGER NIGGER NIGGER NIGGER FAGGOT AND JEWS ARE GAY
GET YOUR ASS OVER HERE AND MAKE ME A SANDWICH BITCH YOU DESERVE NO RESPECT YOU OBJECT! high