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1.
The sudden "sickness" that you catch, preventing you from completing your New Year's Resolution.
Bill: McDonalds? I thought you said your wife was going to try to lose weight this year.

Ray: She was going to sign up for the gym, but she caught the New Year Flu.
by rydizz January 01, 2012
 
2.
It is a sickness that is brought on by kissing random strangers at midnight of New Year's Eve. It exhibits many of the same symptoms of the common cold or flu.
My throat is killing me and all of my joints ache. I think I caught the New Year Flu from kissing those randoms at midnight.
by Grippstick January 03, 2008