Collared
A term used to define relationship status after one party has received a necklace (or in some cases, a bracelet) from their significant other; a sign of romantic possession.
Example:
"Woah, did you see what John bought Jenna for Christmas?" "Yeah, dude, she's collared now. It's totally official."
"Woah, did you see what John bought Jenna for Christmas?" "Yeah, dude, she's collared now. It's totally official."