Also found in: Dictionary, Thesaurus, Medical, Financial, Acronyms, Encyclopedia, Wikipedia.
1. An abbreviation for "point of sale," referring to the place where a sales transaction takes place. We need to get our POS system up and running before the store opens in an hour!
2. rude slang An abbreviation for "piece of shit," a derisive term for something that one considers worthless, or someone whom one considers deplorable. What do I want this POS for? It's a table with two and a half legs! Only a real POS would use racist terms like that.
slang The police or a police officer. Watch your back, Tom—po-po coming up behind us. They got a po-po stationed at the front.
n. a piece of shit; someone or something completely worthless. (see also piece (sense 4).) This old thing’s a POS. Get rid of it.