hanging up abruptly while the other person is still talking
Colloquial term for rudely slamming the phone down mid-conversation, often with a sense of irritation or dismissal.
He got angry and hung up on me.
It feels awful to be hung up on like that.
From the onomatopoeic sound ガチャ (the clatter of a phone receiver being slammed down) and 切り (cutting off).