A person who keeps useless items to the point of it becoming a physical hazard.
See: hoarder
"John, when are you ever going to throw out those broken clothes pegs? I can't find the baby! You're such a scolaighe!"
When someone accosts a neighbour for cooking purposes at unreasonable hours
Old mate across the road had to pull a David and tried to get potatoes off me at 3am.
When you think you've discovered an idea that is really wise and original but it turns out to have been around for a long time.
Person 1: "I've recently decided that my religion is kindness"
Person 2: "I think that might be a fossilosophy"