To be blown, high, ripped, stoned or blazed is to have an entire body excellence that is utterly inexplicable to an unaware person.
For anyone who has ever smoked herb and had a really crazy mind blowing thought. This is the simple definition to someone with no knowledge of mary jane.
"I was so blown last night and I thought of some crazy shit man!"
"Shut up dude you were just high."
*Sigh* If only you knew.