Embattled Perth Lord Mayor Lisa Scaffidi has finally lost her cool, attacking journalist Liam Bartlett on social media after he confronted her about more alleged unclaimed travel claims.

The lord mayor, who has remained silent through the whole travel rort saga, took the unusual step of blasting Mr Bartlett on the Facebook page titled Don't Let Burgo Go, after a handful of people threw their support behind her just before Nine News aired a story on Monday night about more alleged undeclared travel.

"I was so taken aback by his bad breath given how close he was and the Botox I was lost for words," she posted to the group.

"Seriously though when I can speak I intend to but for now I must respect the processes. Appreciate your message."