What is the meaning of i thaut?

'thaut' is an alternative spelling to 'thought', so 'I thaut' means 'I thought'. I don't know much, but to everything from my knowledge, 'thaut' was suggested a standard spelling in American English, but failed to pass, similar to how 'colour' & 'centre' became "color" & "center" became standard in the US. But, it's more similar to how "thru" (meaning 'through') went thru the standard thing as it was gonna become the standard spelling in the US, but failed to pass. It's now a notable spelling & it's widely used informally, such as "drive-thru".