Some situations are nail-biters. This one's a nipple-biter.

An off-duty cop was allegedly bitten in the chest outside a Gold Coast bar Sunday night, police said.

At about 9:30 p.m., Fernando Cooper, 31, and an off-duty officer got into a physical confrontation outside Gibson's Bar and Steakhouse, the Sun-Times reports.

Police who witnessed the event say the officer identified himself, but the other man didn't back down and continued to assault the cop.

Along with several punches that caused cuts to the officer's eye, the man also "severely" bit the cop's nipple.

Both the suspect and the cop were treated for cuts and bruising to their faces. However, a doctor said that the bite on the officer's chest was so severe, the cop "lost a body part," according to the report.

Cooper has been charged with attempting to disarm a peace officer and aggravated battery to a peace officer, both felonies.

Talk about getting something off your chest.

Matt Bartosik is a Chicago native and a social media sovereign.