When a middle-aged man, often times ungroomed and named Fuzzard, reabsorbs a large, girthybowel movement back into his prickly anus.
After a 5 minute fit of post-partum hysteria, Fuzzard reabsorbed a quite large and girthy bowel movement back into his anus, with the permission of his sphincter. Which was Fuzzard's porcupine eating pineapple.
A person who is always around, usually with spiky hair-hence the porcupine. Every corner, every hallway. There is no escaping the uncomfortableeye contact and awkward conversation intrusions. Wherever you go, there will always be a ubiquitous porcupine that you will never escape from.