Meaning
'Stay pon cow back an cuss cow' — to sit on the cow's back and curse the cow. The proverb condemns turning against, abusing, or insulting the very person or thing that is supporting and carrying you — biting the hand that feeds you. It paints the ingratitude sharply: the rider rests on the beast that bears him and yet reviles it, and the saying is aimed at anyone who scorns their benefactor, mistreats their provider, or repays the help they depend on with contempt.
Examples
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Him live off him madda an still disrespect har; a stay pon cow back an cuss cow.
He lives off his mother and still disrespects her; that's biting the hand that feeds you.
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Nuh badmouth di company weh feed yuh — stay pon cow back an cuss cow.
Don't badmouth the company that feeds you — don't insult what supports you.
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She use him help an chat him bad; stay pon cow back an cuss cow.
She used his help and spoke ill of him; that's abusing the one who carries you.
Origin
A vivid image: to ride on a cow's back — carried and supported by it — while cursing the very animal beneath you.
How it’s used
A sharp criticism of ingratitude — turning on the person or institution that sustains you.