1) To make to appear holier or better than it actually is.
2) To presentsomething or someone as perfect when it/he/she obviously isn't.
3) To gloss over someone's faults - e.g. what a political party does to its own candidate.
Guy 1: Bro. CNN said that Hillary has a spotless record and decades of dedicated service.
Guy 2: Don't fall for Clinton News Network, man... They try to angelicize her.
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.