[ It was something of a relief to hear her agree to not use it unless she had to, it wasn't like he could really police what people said but she seemed like such a nice girl. It would have been a shame for her to be ruined by someone's shitty colloquialisms. He leaned back against the couch again, head craning toward the ceiling as he let out that sigh of relief. ]

I mean, I guess you'd just say it when you wanted someone to know that you've got it out for them. It's not like you're supposed to use it literally or anything...