One of the earliest examples of WAM on the internet (besides messy slimy tv game shows) I can remember is a set of photos (perhaps a video as well) of a blond haired woman being deluged with slop.

She was wearing a short skirt, blouse and waist coat. I think it might have been a revenge set up. She may have been covered in beans, custard.

It was an amateur video or photos.

It may have been from the eighties, nineties or very early 2000s. Does anyone remember it?

Sounds like the early splosh magasines.

It wasn't in a magazine.

It was a woman who played pranks on people who then got their own back.