1. Really effing early.
2. An ineffectual or insubstantial person. Alternately, someone who is physcially slight or tiny.
1. We had to get up at sparrowfart in order to get there just as they opened.
2. My eighth grade English teacher was a sweet little sparrowfart of an old lady.
A person you hate intensely not because they deserve such hatred but because they serve as a focus for your general hatred. A healthy way to dispense with excess animosity.
Jake's not really that big an asshole. He just serves as my hate sink.