Meaning
A stupid, dull-witted person — a blockhead whose head seems as solid, heavy, and brainless as a yam. It is a plain insult about a lack of intelligence or common sense, close to 'lagga-head' and 'dunce-head', flung at someone slow to catch on or foolish in their doings. The homely image of a head made of yam, all starch and no thought, gives the word its mocking bite in a culture that prizes 'brightness'.
Examples
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Nuh act like a yamhead.
Don't act like a blockhead.
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Di yamhead bwoy cyaa figure it out.
The dull-witted boy can't figure it out.
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Him too yamhead fi understand.
He's too thick-headed to understand.
Origin
A compound of 'yam' and 'head' — a head as dense and empty of brains as a starchy yam.
How it’s used
A blunt insult about intelligence, close to 'lagga-head'. Insulting but usually not the harshest of words.