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1.
a sudden, intuitive perception of or insight into the reality or essential meaning of something, initiated by piff.
M: *cough cough* I finally understand the meaning of life...
S: Dude, you have to tell us!

M: uh? um... I forgot, what a waste of a piffany.
by Some Dirt Mark June 07, 2009
 
2.
The act of making a noisy disturbance of anger due to the actions of another person, or event.
No dude I can't toot up that weed, if my mom found out I was stoned she would have a piffany on the front lawn
by Iveben Smokena September 26, 2007
 
3.
A realization of something hilarious you did, but only other people noticed. But know you finally figure out why they were laughing.
Bob: Man, I cant believe all those chicks were smiling at me after the play.
Patrick: Thats cause you still had the lipstick on.
Bob: Damnit. I Hate Piffany`s.
by Amanda&Rebecca December 08, 2008