Having diarhea in the shower, most often after a night of heavy drinking and are too tired to make it to the toilet. The phrase is derived from the sight of the loose stool being dissolved away in the shower drain leaving only remnants too large to pass through the grate.

Used to describe (generally female) imagery that's suggestive, but in a PG-13 sense rather than an R or above sense.

editing for Urban Dictionary

When you take a shit and you have diarrhea followed by solid feces, as if you were panning for gold. This is especially true if you have eaten corn.

When someone who is delivering a Cleveland steamer is also receiving a golden shower and residual urine falls on the recipient of said Cleveland steamer