I thought she said "towel."
Bonus: Rogue One gifs thread.
And Star Wars Battlefront IV Concept Art image gallery (including Jedi Ventress, Maul, and Dooku).
"You can see Laura Dern say 'pew' when she fires the gun, which she could never not do every time she shot it." — Rian Johnson, Star Wars: The Last Jedi Commentary pic.twitter.com/Wkr803BQte— gabrielle (@daisyridleee) March 13, 2018