'You messed with the wrong girl!' Phone thief picks on 4'9" woman who turns out to be an MMA fighter—she batters him into a bloody mess.

A 4-foot, 11-inch woman was getting mugged for her cell phone. But the thief didn't count on her knowing martial arts.

So, the woman gave him a beating of a lifetime. And that almost makes us feel better than puppies and kittens.

Brisa from Mar del Plata, Argentina, was going home from work when a thief snatched her phone.

Instead of panicking, the 20-year-old chased the thief down the street and finally caught up to him.

She then grabbed him and began delivering a volley of punches and strikes that left the man bruised and bloodied.

Brisa, who practices martial arts, also managed to put the thief in a headlock, despite the fact she's just 4'9" tall.

Footage from the scene shows the young woman grabbing the thief by the neck and braiding him with her two legs.

She then shouts angrily in his ear:

"Son of a b***h. Get a job!"

"You think I spend all day locked up at work jus so you can steal from me in three seconds?"

According to reports, the young woman didn't release the suspect until cops arrived and took him away in handcuffs.

Brisa later explained she was so angry because she spent months saving up to buy the phone.

In an interview with the TV show 'Nosotros a La Manana, she said:

"I spent all day working during a pandemic with a reduced salary. And I refused to accept this guy coming along and making more than half my wages in three seconds."

"Hopefully, this guy never steals again."

"I was lucky because I know how to defend myself as I practice MMA, but I don't want it to happen to anyone else."

The young woman added:

"I'm proud of how I acted, and I don't regret a thing."

This isn't the first time for a thief to 'pick on the wrong woman.'

Just recently, an 82-year-old female bodybuilder from Rochester, NY, beat up a thief who broke into her home.

Willie Murphy was getting ready for bed. But a man started pounding on her door, saying, 'I'm sick, I'm sick.'

When Murphy called the police and wouldn't let him inside, the man broke down the door.

So she grabbed the closest thing she could find to defend herself—a table with metal legs.

She beat up the thief with the table until it broke. Cops arrived soon after and arrested the suspect.