When you have gotten your girlfriend drunk off of bailey's and bran muffins, stick it in her ass and pull out quickly. the result, is the makings of many small potato like droppings, hence the Irish potato factory. ;)

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.