Definition & Meaning of "have another thing coming"

What is the origin of the idiom "have another thing coming" and when to use it?

The idiom "have another thing coming" originated as a colloquial variation of the earlier expression "have another think coming." This phrase, in turn, emerged in the 19th century, likely in British English. Over time, it evolved into the current form, "have another thing coming," possibly due to the influence of regional dialects and usage. The expression is now used to convey a sense of correction or surprise to someone who holds a mistaken belief or expectation.