A great time or an event that is done whilst under the influence of weed. Or plainly just the time you smoked some Mary Jane.
Robbie, George and I had an extravaganja last night! We smoked two Henry's and now can't find George!
by callumcookie November 15, 2014
by Pete Larson September 29, 2006
"yo, i didn't see you at my party yesterday." "well, exams are tomorrow, and it was a total extravaganja, so i wanted to be focused and stuff." "true dat."
by Spencer Rapson March 3, 2008