noun, noun or participle which takes 'suru', intransitive verb
heavy eating and drinking; gorging and swilling
A yojijukugo describing excessive consumption of food and drink, often in a lively or indulgent manner. Can be used as a noun or with する as an intransitive verb.
忘年会では、みんな牛飲馬食していた。
At the year-end party, everyone was eating and drinking heavily.
彼の牛飲馬食ぶりには驚かされる。
I'm amazed at the way he gorges and swills.