A piglet.In the mid-sixties I changed to finishing all pigs instead of selling bonhams....
She counted seven shillings and ten pence and she said to her son Pat: ‘I think you should go to the Fair in the morning to buy a bonham or small pig.’
Gossip was exchanged and embellished, births, deaths and marriages were discussed and the price of bonhams and dropped calves were dissected.
Origin
Late 19th century: dialect variant of Irish banbh 'pig'.