1
general::
Phrase(s): chow (something) down
Sl. to eat something, usually quickly or without good manners. • We can chow this pizza down in about two minutes! • I found a box of cookies and chowed it down before anybody knew what I was doing.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
Eat, as in He's always ready to chow down at dinner time. Originally military slang, this term is now more widely used. The noun chow in the sense of food, originating from either Chinese or pidgin English in the 18th century, also appears in such terms as chow line, a line of people waiting for food, and chow time, mealtime. [Slang; mid-1900s]
American Heritage Idioms