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1.
A festival involving eating considerable amounts of food,
derived from the saying nomonmnom.
Broseph: Hey im hungry

Jesus: Wanna head to that nomfest?
by jesusisbroseph April 13, 2010
 
2.
A day of high food consumption, i.e., Thanksgiving.
Alex: What are you bringing to the picnic tomorrow?
Nate: Nothing but an empty belly. The nomfest always have leftovers, good thing I'm a garbage disposal.
by parkca01 November 19, 2010