Sheldon’s Silver’s efforts to stay out of prison have made it abundantly clear that no one, not even judges, knows what constitutes bribery anymore — thanks to the US Supreme Court.

On Wednesday, Silver’s lawyer argued with three seasoned federal appeals court judges to keep the ex-Assembly speaker out of prison while he fights his second conviction over $4 million in bribes.

Attorney Meir Feder told the judges Silver’s case will be overturned because the Supreme Court narrowed the definition of bribery to such an extent that what Silver did amounted to a mere “conflict of interest.”

“Bribery is narrow. It’s not just for an official agreeing to do things when they are receiving something,” Feder said.

Feder was referring to the Supreme Court’s 2016 decision vacating the conviction of ex-Virginia Gov. Robert McDonnell for pocketing more than $165,000 in loans and gifts from a business executive in exchange for help promoting a dietary supplement.

The high court ruled McDonnell did nothing wrong because he never took an “official act,” like legislation, to help the exec. The court also ruled that the “formal exercise of governmental power” must be “specific and focused,” suggesting bribers have to have specific favors in mind for it to count as bribery.

“It’s a very specific crime where you’ve got to find they were doing specific things,” Feder told the judges on Wednesday — setting off a game of hypotheticals centering on a “bag of money” swaying a legislator to vote a certain way.

Judge Barrington Parker first asked whether it’s bribery if the guy drops off the bag of money — without ever uttering a word.

Feder agreed that’s still bribery — as long as the jury finds they were in cahoots.

Then Judge Robert Sack offered a scenario in which the guy gives the legislator the “sack full of money” by mistake.

“Right — that’s not bribery,” Feder said.

Prosecutor Daniel Richenthal disagreed, saying it doesn’t matter what the bag man wanted so long as the crooked pol thinks he’s being bribed and takes action as a result.

The judges said Silver, 74, can remain free on bail but ordered that the paperwork for his appeal be turned in by Dec. 3, meaning the Lower East Side Democrat could land in prison before year’s end if he loses.

“The US Supreme Court keeps moving the goalpost when it comes to bribery,” Blair Horner, legislative director at the New York Public Interest Research Group, told The Post.

Silver has not spent a day in prison since he was busted in 2015 for two schemes, including sending half a million dollars in state grants to a cancer doctor who was sending Silver’s law firm lucrative patient referrals.

His first conviction was overturned by the same appeals court due to errors in the jury instructions tied to the McDonnell decision.