describes a person who is eating rather voraciously, ie setting back the food already in their mouth, for more, before chewing it Example: gee, that chappy must really like those flapsticks. he's settin' it back like nobody's business!
SETTIN' IT BACK
Meaning of SETTIN' IT BACK in English
Slang English vocab. Английский сленговый словарь. 2012