Picked it up in Kirkwall. Fun, isn't it? The dwarf merchants used to say it to shock us humans. I couldn't resist trying it out, and it just stuck. But for what it's worth, I do think flaming tits would go a long way in recruiting more people.
Don't worry about it. If the Hero of Ferelden can't be fashionably late, what hope does anyone have? Makes more of an impression, anyhow.