(informal) A person with whom one has a fling, or casual romance.
2008, Wendy Etherington, Hot Pursuit (page 241)He never thought of her as temporary or a flingee.
2011, Sheila Simonson, LarkspurJay was trying to track down the flingees. Denise had never married, nor had she taken another long-term lover after Dennis's birth, though she had been seen in fashionable places with a variety of leading men.
2013, Aorewa McLeod, Who Was That Woman Anyway?Brendy pointed out to me that a fling is different from an affair. 'A fling is definitely not serious—it's meant to be temporary and the flingees remain good friends afterwards.'