look up any word, like dirty sanchez:
 
1.
A music festival generally lasting several days.
Are you going to that festie in nor cal this summer?
by wonder_wingnut April 02, 2011
 
2.
Those who frenquent renfaires as customers, often with seasons passes, but who are not part of the performing cast or otherwise work for the renfaire (ie. rennies). Usually some sort of badges are worn by workers and performers of a renfair as proof that they are employees. Because they add to the general atmosphere of a renfaire, most renfaires encourage festies to wear garb, thus creating the need for the badges to tell worker from patron.
They're not rennies, they're festies.
by DeadManPete October 14, 2006
 
3.
Disgusting, Moldy, Filthy, Horrible ... Think about the adjective to Festering ... That would be festie and or fest. It is imperitive that this word end in an "ie" and not a "y" to embody the full effect of FESTIENESS ...
Clean the FESTIE dishes ... Your shoes smell like FEST ... That FESTIE guy is hitting on her ... Festering in ones own FEST ...
by Linnie and Brad I.D.M. August 05, 2003