when you feel high from something other than illegal substances.
"the combination of Nos, Jolt, and a happy meal gave made me feel so high"
"it was definitely a pseudohigh man"
the high that you get without actually doing the drugs, but just from being around the people who do; usually just from breathing in second hand smoke
At the concert last night, there were so many potheads that even though I wasn't smoking, I got pseudohigh.