Definition of "offaling"

Be careful that all slops or offaling from the kitchen or laundry work is soon conveyed away, or disinfected at once, […]

1880, Annual Report of the Board of Health of the State of New Jersey, page 85

[…] the removal of all soiled liquids, and of such offaling, secretions and excretions as are easily or naturally reduced to a liquid or semiliquid state.

1881, Franklin Benjamin Sanborn, Journal of Social Science, page 32