The first time someone offers you a wet stick, you should not be alarmed. You should ask what node count, whether it has roots, and what mother plant it came off. If you answer correctly, the seller relaxes a little. You have passed a small test you didn't know you were taking.
Every serious hobby develops a private language, and rare aroids are no exception. The vocabulary that has grown up around Philodendron, Anthurium, and Monstera collecting is part Latin nomenclature, part horticulture, and part eBay slang from 2019. Used well, it's precise. Used badly, it sounds like a teenager trying to buy a car. What follows is a working glossary — not exhaustive, but enough to read a Facebook group thread without embarrassing yourself, and enough to spot the seller who's bluffing.