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

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from We'll never spam you.