STAR WARS EPISODE II: Attack of the Clones 00:24:28

The subtitles for this scene read "Wee Shahnit... Sleemo" but if you listen closely, she clearly says the Huttese word Murishani translating to "bounty hunter".

In Star Wars Chronicles: The Prequels by Pablo Hidalgo, he writes that Zam's last words are "murishani sleemo".

The Rise and Fall of Darth Vader by Ryder Windham, a young adult novel from 2007 which retells the events of the Star Wars saga from Anakin/Vader's viewpoint uses the words "Wee shahnit".

R.A. Salvatore's novelization of Attack of the Clones simply omits the line altogether, with "It was a bounty hunter called-" being Zam's last words.

Thanks to @darkblades75 for sharing the script page and also suggesting to check the Attack of the Clones comic adaptation from Dark Horse Comics. Much like the novelization, both the script and comic leave Zam's last words as "It was a bounty hunter called..."

One more source to add, and so far the most recent, adding a little wrinkle to the mix, the 2019 Star Wars By the Numbers video "Every Language in Star Wars Movies" identifies Zam Wesell's last words as being spoken in Clawdite. Here's an archived video on the Wayback Machine, as the original video has now been made private.