Geez. What exactly do you think "to coin a phrase" means? Take a deep breath, junior. The Republic is not in danger just because your representatives think smoking pot is a detriment to the general welfare.
...(snicker)...
"To coin a phrase" means to create a phrase. With this usage, Appalled was, in fact, claiming that he/she created the phrase. I think he/she meant "to borrow a phrase."