deucing it up

The act of taking one or more epic dumps. Usually, this term is used when you're making multiple trips to the throne for various reasons like, taking a laxative, getting bubble guts from eating White Castle, or doing a purge or a cleanse.

I was constipated after taking some antibiotics, so I took some milk of magnesia and I was deucing it up for like 9 straight hours. I filled that cup to the brim and shot it down like bourbon.