A form of revenge. When one shits on anything or anyone that is not meant to be shat on, thus destroying that beings confidence, reputation and personal property. This can stem from extreme hatred and disgust of the person or owner of the object being shat on. An important part of swindling is discretion. The person being swindled must not know it was you who swindled them and must remain confused as they angrily clean up the shit you have bestowed upon them.
Jon: Dude, I just swindled Mark so bad!
Jon: he stole my bitch so I took a shit in his bed!