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It seems to be a real definition, see definition 6 under etymology 2:
> (transitive, law, especially New Zealand)[1] To subject [someone] to a trespass notice, formally notifying them that they are prohibited from entry to a property, such that any current or future presence there will constitute trespass, (especially) criminal trespass
You have to be informed that you're not allowed to be on the premises ("trespassed") and be allowed to leave before you can be charged with trespassing.
I don't use it that way, but it is correct. "The property owner or police barred you from the property."
I had never heard it until recently, and now this is the third time I've heard it used that way.
This is a personal pet peeve though in a descriptive sense the language has moved past us https://wiki.roshangeorge.dev/w/Blog/2025-12-10/Trespass
Personally, I have decided that The Lord's Prayer now has the new and alternative meaning when it reads:
Forgive us our trespassesI have heard my friends here in the USA say it about someone locally who is known to cause trouble with businesses. I had never heard it said that way until they said it that way.
To be trespassed means given legal notice to stay away from now on. If you don't, the cops will often be called at that point.
It's colloquially used like that in the blackjack community. "Being trespassed" by a casino means the casino informs you that you must leave and that if you return, you will be guilty of trespassing.
It can also be used to mean "kicked out and told they can't come back".
As I understand it, "to be trespassed" is a term of art that basically means "the cops were called, told that person was trespassing, the cops duly informed that person they are trespassing & had to leave the property, and the person left, but was not charged". It's basically establishing a legal trail so that if the person refuses to leave or continues to trespass at that location in the future they have a better basis for charging them.