A US woman who allegedly keyed her friend's car with a misspelling of the word "whore" has hit back at internet trolls, saying she "isn't an English major".

Shannon Csapilla, 20, from Stamford, Connecticut, was arrested last week after cars belonging to her ex-boyfriend and one of her friends were found keyed, with their tyres punctured, earlier this month, WTNH reports .

Police said the word "wore" had been scratched into the side of the woman's car, leading officers to believe the vandalism was the result of a messy love triangle.

Csapilla allegedly sent harassing text messages to her ex-boyfriend after the damage was found, in which she admitted she was the vandal.

She denied the charges after being arrested last Thursday, and posted a photo of the police building on the Snapchat social media site with the comment "Stamford police have nothing on me".

"Unbeknownst to her, we did have enough and we obtained two arrest warrants from a judge and took her into custody at her home," Lt Diedrich Hohn said.

With the story having gone viral, Csapilla took to her Instagram account today to hit back.

"To everyone who thinks what I did was "hysterical", what I did wasn't okay, but what you all are doing to me isn't, by any means, okay either," she wrote.

"Don't worry, I'm not an English major. We all make mistakes. Move on with your lives."

She was charged with criminal mischief and released on $10,000 bail.