Top definition
the ramp-up in highness following a cannabis-based smoke session, usually rising by 1 or 2 extra points after the initial peak is reached
After smoking with my friends, I went home to watch TV. It was after sitting for a couple minutes that I got PSI (Post-Sesh Intensification) and went from a 6 to an 8 almost immediately.
by rawloes June 20, 2011
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