Learn what "but first thing" means, when people say it, and how to use it naturally in English.

It means the speaker is warning someone to get away quickly because trouble is coming.
From I'M Obsessed With My Boss Part Ii, Episode 36
The speaker tells someone they should back off or leave quickly.
This is often used jokingly or dramatically, but it can sound threatening in a real fight. It is not appropriate in polite conversation.
Scenes unlock real expressions as you watch
Tap to translate or use dual subtitles
Practice immediately with AI Characters
Reinforce with quick quizzes and repetition
Build speaking confidence with drama-based context, instant explanations, and AI-powered practice tailored to real conversations.
Start learning