be (as) homely as a hedge fence

To be very plain and unattractive. If you don't put on a little bit of make-up, this guy will think you're homely as a hedge fence, which is kind of the opposite of what we're going for. Honestly, he's as homely as a hedge fence to look at, but he's smart and sweet, and that's all that matters to me. Who cares if she's homely as a hedge fence? Her father's a billionaire—do you know how much money you could inherit one day?