day's leavings

Any accumulated organic residual film remaining in the underpants of an individual at the end of the day, consisting of one or more of the following: dead skin, hair, sweat, lint, feces, urine, and/or ejaculate.

Guy 1: See that hot barmaid with the tattoos that's been rushing around all night?
Guy 2: Yep. I bet she's kinky.
Guy1: I'd drink her bath water.
Guy2: I'd eat her day's leavings.