Apparently frompost-it note, influenced byPostum, a brand of coffee substitute
postumnote (pluralpostum notes)
- Apost-it note.
2016, Gerald James Avila,Home for Good:He pulled a giant burrito from the ice chest, when he swung the fridge door open for a drink, he saw a largepostum note, “Joan and I cleaned your fridge, it was so disgusting it was beyond words. So my suggestion to you is, “never bring home left-overs from a restaurant, it turns to ----."
