look up any word, like sparkle pony:
 
1.
Where you do nothing but smoke weed all day.
Pete: you commin over today?
Steve: na, im bout to sit inside all day and have an extravaganja.
by Pete Larson September 29, 2006
 
2.
a party or social function involving preposterous amounts of Weed.
"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 02, 2008