The sexual act of two people placing each other's anuses against one another, then defecating into each other's asses. Is not specific to either gender, any two people can perform the Wilmington Wombler. Known to be quite messy. It's generally best to put a tarp down first.
Place of origin: Wilmington, Ohio
"Dude, I was gettin bored with this bitch, so I decided to spice things up so we did a Wilmington Wombler."
"Oh dear me, last night my husband of 43 years asked me do a Wilmington Wombler with him. I didn't know what it was, so I said yes."