drunkorexia
n. Eating less to offset the calories consumed while drinking alcohol.
Other Forms
Examples
2011
Drunkorexia is characterised by mostly restricting the day before, the day of, and the day after going out drinking. Restricting meaning skipping meals, not eating at all or eating very little in order to counterbalance or contradict the calories that alcohol contains.
—Hayley Hannan, “Women starving themselves to allow for booze calories,” The New Zealand Herald, November 02, 2011
2011
Consuming alcohol without eating, sometimes referred to as "drunkorexia," is a growing trend among students and has long-term effects on the body.

In a survey completed by students at the University of Missouri-Columbia, one in six students said they restricted food in order to consume alcohol within the last year.
—Sarah Hauer, “Drunkorexia: No eating, more drinking,” The Marquette Tribune, October 25, 2011
2007 (earliest)
Now there is drunkorexia—another new and buzzworthy term for some not-so-new behavior. According to this report on The Morning Show (featuring our friend Sondra Kronberg, an eating disorders specialist from the National Eating Disorders Association of Long Island), 30% of women ages 18-23 restrict food calories so they can drink more and not gain weight from their alcohol consumption.
—Claire Mysko, “Drunkorexia: Starving and Boozing,” 5 Resolutions, December 12, 2007