frommage

noun: 1) When you are not sure or have no knowledge of where it has come from. 2) An out of place or indescribable thing that has appeared from nowhere. 3) Stuff that is leftover after performing an act.

1) The stuff underneath the couch/lounge can only be described as frommage. 2) Some frommage was found at the back of the refrigerator. 3) After eating dinner there was frommage on the floor.