Jyut talk:E928030FE63C7852
From Wenlin Dictionaries
--Rscook (talk) 16:10, 9 April 2019 (UTC)
In Eng. 'black cow' is a 'root beer float', and also '(alcoholic) drink made with kahlua/etc.'; might be similar range of meaning here.
https://zh-yue.wikipedia.org/wiki/黑牛
黑牛係香港或澳門茶餐廳嘅特色嘢飲,一杯可樂加上一個朱古力雪糕球就係黑牛
黑牛 doesn't seem to occur in Mandarin; it's not in 《中文菜单英文译法》the official 2008 Beijing Olympics menu list.