"Revenge body" is the process, or rather the result, of shaping up and getting a makeover following a breakup in order to make the person who dumped you regret his or her decision.
For example, this is what American TV personality La La Anthony apparently did after she filed for separation with her husband, NBA player Carmelo Anthony.
It should be noted that the "revenge body" is hardly a new fad. According to Vanity Fair, the term was coined by tabloids earlier this decade and then popularized by fitness magazines.
Nevertheless, this concept witnessed another surge in popularity this year following the launch of Khloe Kardashian's show Revenge Body with Khloé Kardashian.
And while it’s hard to tell whether it's worth getting in shape merely to spite an offending party, getting a "revenge body" may be a good way to improve oneself and boost one’s self-esteem after a serious life crisis.