Definition & Meaning of "rats"in English

What is the origin of the exclamation "rats" and how is it used?

Rats is an exclamation used to express disappointment, frustration, or mild annoyance. It appeared in English in the early 20th century as a euphemistic, lighthearted substitute for stronger curses, likely inspired by the negative associations of actual rats. People used it in everyday conversation, comic strips, and family-friendly media to react to small setbacks or irritations. Today it is inoffensive, playful, and informal, often signaling minor frustration or disappointment without being vulgar.