I don't think that I've ever misspelt 'the' as 'teh' unlike many others.

Meh, in anycase, for me:

'form' instead of 'from'
'mwh' instead of 'meh'
'thijnk' instead of 'think'
'aboot' instead of 'about' (But I do that on purpose...noo doot aboot it)