to fart in the shower with your spouse or partner and then abrubtly leave
My wife wouldn't have sex with me in the shower, so I left her to toil in a watery grave.
A glass of iced tea that is half water and half black tea.
Customer: I'd like a large watery grave for here.
Barista: Sure. Would you like that in a to-go cup?
Customer: No, I said for here.
Barista: Ok.