News outlet BuzzFeed has abandoned its truth defence to claims Emma Husar is "a slut who boasts about who she has had sex with", in a major win for the Labor MP in her court battle against the company.

Ms Husar, 38, the federal member for Lindsay, is suing BuzzFeed and its former political reporter Alice Workman for defamation in the Federal Court over a story, tweet and Facebook post on August 2 last year detailing allegations of misconduct made against her by staff members.

Emma Husar leaves the Federal Court in February. Credit:AAP

She claims BuzzFeed conveyed a range of false and defamatory allegations about her, including that she is "a slut who boasts about who she has had sex with, which includes other members of Parliament and members of her staff".

BuzzFeed says it did not use the word "slut" and the publications do not convey that imputation, but had nevertheless sought to rely on a defence of truth if the court found those claims had been made.