The other day an English student had a bag of M&Ms out. We were helping ourselves to them when he announced that they are quite morish.
Since the letters didn't appear in the air, I initially thought he meant "Moorish," but I was perplexed at the connection. Then I realized he meant "makes you want it more." Despite having worked with a number of Britons in Japan, I hadn't recalled hearing that. When I asked him whether it were a Britishism, he laughed and shrugged his shoulders.
He did acknowledge it had nothing to do with Moors, moors, or even mores.