its when you attempt to smoke 2 grams out of a bong in one hit, and then smoke 2 blunts really really fast. try it.
hahahaha, im guessing your reffering to something somebody told you that was there reason they dont smoke weed. i dont know what it is, but i guess its when your spirit is high... just guessing though.
Rofl, you're all wrong but a spiritual high is best achieved through use of psychedelics such as shrooms, lsd, dmt, etc.. Basically its a high that brings you the closer than you've ever been in your life to whatever god/religion you believe in. Its rough to explain but when you're experiencing a spiritual "high" you'll know it. sry wish i could explain a little better, but its 7 am here.
Didn't see your topic but just made one of my own here which I think will answer your question; http://forum.grasscity.com/real-life-stories/374034-salvia-spirits.html