Verb
be a one (third-person singular simple present is a one, present participle being a one, simple past was a one, past participle been a one)
(UK, dated, informal) To be amusing in a slightly challenging way.
It was the craving to be a one and only people which impelled the ancient Hebrews to invent a one and only God whose one and only people they were to be. Eric Hoffer
A dead end can never be a one way street; you can always turn around and take another road. Bo Bennett
When I was a boy I was always depressed and confused, now I think I'm not garbage. I don't try to prove to my parents that I am good at something anymore. But I am a failure with women. I can only be a one night lover. Vincent Gallo