I'm Idioma

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I'm afraid so

(See afraid so)

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I'm straight

cool, no problems

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I may be daft, but I'm not stupid

I might do or say silly things occasionally, but in this instance I know what I am doing (Usually used when someone questions your application of common-sense).

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I'm telling you|tell

informal It is important to listen to what I am saying. Marian is a smart girl but I'm telling you, she doesn't always do what she promises.

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from Missouri, I'm

from Missouri, I'm
I'm extremely skeptical so you'll have to prove it. For example, You won the lottery? Come on, I'm from Missouri. The full expression, I'm from Missouri and you'll have to show me, dates from about 1880. Some authorities believe it alludes to the Missouri Compromise of 1820, whereby Missouri was admitted to the Union as a slave state and slavery was forbidden in certain other areas, but the connection, if any, is not clear.

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I'm from Missouri

I'm from Missouri
see from Missouri, I'm.