Precedent of the united states

[Britney]

Refers to an acquired from the past habit/routine/action/policy, usually of questionable morals/ethics. It originates from a practice that a former U.S. [prez] began many years ago, and so then one or more [C-in-Cs] have partaken of same sinfulness on numerous occasions since then because they [figger] that it is something they can get away with and thus they should be able to do it themselves.