Meaning
'From mi yeye deh a mi knee' — since my eyes were down at my knee, that is, since I was a very small child. A vivid, playful way of saying 'from way back', 'ever since I was little', or 'for as long as I can remember', it pictures a person so small that their eyes seemed to sit no higher than their knee. Reaching far into the past, it stakes a claim of long familiarity — knowing a person, a place, or a thing from earliest childhood right up to now.
Examples
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Mi know dat family from mi yeye deh a mi knee.
I've known that family since I was knee-high.
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Mi a eat dis food from mi yeye deh a mi knee.
I've been eating this food ever since I was a little child.
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Wi a friend from mi yeye deh a mi knee.
We've been friends since way back when I was small.
Origin
A child's-height image: a small child's eyes reach only about knee-height on an adult, so 'when my eyes were at my knee' means when I was very young. 'Yeye' is the Patois word for eye.
How it’s used
An idiom meaning 'since early childhood' or 'for as long as I can remember'. See [[yeye]].