festy adjective 2noun 1forms 3 adjective2 •(Australia, slang) Disgusting.God knows I've had my fair share of festy flatmates who started out all sweetness and light... :) — 1997 •(Australia, slang) Very bad, dreadful. noun1 •(slang) A festival.Keeping that festy vibe going, we've just been promoted to headline act for the REBIRTH festival this weekend in Cardiff! — 2002 formsfesties · more festy · most festy