Obvious tension and hostility between two people who have hooked up and now hate or resent each other without trying to hide it.
When you hookup with a co worker and then start to hate them and have to be around them, there is a lot of hookup hostility in the room.
When you are hooking up with someone and they screw you over and you still have to be around them, there is a lot of hookup hostility.
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