The first time you bring a significant other around your friends to see what they think of him/her.
At first, I really liked her, but when she failed the friend test, I had to let her go.
Fat finger, as applied to the iPhone. When someone hits more than one key on their iPhone touch-screen while typing.
While texting his friend, Bob iPhingered his touch-screen and sent a bunch of incoherent gobbledy-gook.