What else does champ mean?
Hot mashed potatoes and vegetables are a classic Irish dish. This is made from combining peas and chives with hot mashed potatoes. Then, you make a depression at the middle of each portion by adding melted butter. You need to dip every forkful in the butter before you can eat it. (in Cooking Dictionary)
It is to eat or chew on loudly. (in Merlin Dictionary)
You should vigorously work your jaws and teeth. (in Merlin Dictionary)
( Champ at the bit (To express impatience when being delayed or held back. (in Merlin Dictionary)