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Adjective. Bad, disgusting, undesirable, revolting. Backconstruction from verb "fester".
"Awww, Mum! That broccoli is really festy."
by Skyring August 17, 2004
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"Festy" describes anything that is dirty and/or smelly. It is particularly used to describe people, but may be used to refer to objects or animals.
Eew! You smell festy!
That guy is so festy.
I'm not touching that festy bandage.
Don't let your festy dog into my house.
by Luke January 08, 2005
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(noun) A person who lives to go to music festivals. A sort of lovechild of a hippie and a raver. Commonly sporting one or two dreadlocks and/or a partially shaved head. Loves face paint, henna, anything glow-in-the-dark, tattoos, music (especially dubstep, electronic, indie, folk, alternative), eastern/new age themed religions, hallucinogens and hula hoops. They generally refer to festivals as "home." Rainbow Gathering and Burning Man are the Meccas of festies.
Joanna and all of her festy friends rented a bus to drive to Burning Man.

Mitch: I can't even afford toilet paper, man. I bought tickets to Sasquatch, Coachella, Shambhala, AND Burning Man.
Joe: Dude, you're such a festy.
Mitch: What can I say. Festivals are home.
by cad_dy January 15, 2013
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That tiny bit of weed left on the table which all the fiends scrape up regardless of other debris on the table and smoke it.
Me: Man don't smoke that, that's festies.
Fiend: Nah man this is good stuff.
Me: *Facepalm*
by Anonystoner July 13, 2009
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