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2.
Usually occurring at a concert, in an atmosphere with lot's of people smoking (most likely weed) and exhaling mass amounts of smoke into the crowd. You then inhale a mass amount of this second-hand smoke, and end up high.
Person 1- "Man, you are SO high."
Person 2- "Nah man, there was just SO much smoke at that concert, I probably got second-hand high."
Person 1- "Makes sense dude, makes sense."
by wonderous12345 September 26, 2010
 
1.
When you get high off of someone elses second hand smoke, usually weed. IT IS POSSIBLE.
Ricky and Trev were clam baking the shed last night and it gave me a second hand high!
by Julia Raymond December 18, 2006