The Senate Judiciary Committee released letters Thursday from friends and former Georgetown Preparatory School classmates of Supreme Court nominee Brett Kavanaugh, backing up his claim that the reference to "Devil's Triangle" in his yearbook is a drinking game, and not a sexual threesome as it is otherwise known.

CNN's Jake Tapper shared two letters that were sent to Judiciary Committee Chairman Chuck Grassley, R-Iowa., and ranking member Dianne Feinstein, D-Calif.

A letter from Kavanaugh's ex-Georgetown Prep classmates not only defended Kavanaugh's description of the term before the Senate Judiciary Committee last week, which has become a sticking point for Democrats poring through his yearbook, but also explained how the game was played.

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"'Devil's Triangle' was a drinking game we came up with in high school," said a letter signed by DeLancey Davis, Bernard McCarthy Jr., Paul Murray, and Matthew Quinn. "It was a variation on the game 'Quarters.' When we played 'Devil's Triangle,' four people sat at a table. On the table, three small glasses of beer were arranged next to one another to form a triangle. Each of the four participants took turns being the 'shooter.' The shooter attempted to bounce a quarter into one of the glasses. If the quarter landed in one of the glasses, the person at the table sitting nearest that glass had to drink the beer."

The four went on to say they can't remember the origin of the game's name.

"We do not remember the exact origin of the name, but none of us used the phrase 'Devil's Triangle' in our yearbook to refer to any kind of sexual activity. To us it was just a game with glasses in the shape of a triangle. If the phrase 'Devil's Triangle' had any sexual meaning in the early 1980s, we did not know it."

A number of phrases in Kavanaugh's yearbook have come under intense scrutiny by Democrats and the media as the judge has faced and denied multiple allegations of sexual assault during his high school and college years.

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Kavanaugh said the term "Devil's Triangle" referred to a drinking game, rather than a sexual threesome with two men, as it described by Urban Dictionary; and that the word "boof" referred to flatulence, rather than rectally imbibing alcohol.

His explanations were unconvincing for Sen. Sheldon Whitehouse, D-R.I., who accused Kavanaugh of lying. "I don't believe 'boof' is flatulence, I don't believe a 'Devil's Triangle' is a drinking game, and I don't believe calling yourself a girl's 'alumnius' is being her friend,” Whitehouse said Friday as the Judiciary Committee prepared to vote on Kavanaugh's nomination.

Kavanaugh's nomination was advanced by a party-line vote last week, but a full Senate floor vote was put on hold as the FBI conducted a supplemental background investigation. That has now concluded and the Senate is expected to have a final vote on the Kavanaugh nomination over the weekend.

Kavanaugh's 1983 Georgetown Prep yearbook was published online by the Internet Archive on Wednesday. According to a yearbook post, McCarthy was credited with creating the game.

A second letter shared by Tapper was written by Greg Aceto and Bill Van Pelt IV, who said they attended Boston College, which is a couple of hours' drive from Yale University, where Kavanaugh was an undergraduate student. They said they lived with Quinn, who taught them the drinking game "Devil's Triangle."

"We did not understand 'Devil's Triangle' to have any sexual meaning," they wrote. "It was simply a game that used cups or glasses of beer placed in the shape of a triangle."

Not all the people in Kavanaugh's past agree that "Devil's Triangle" was just a drinking game. James Roche, who shared a two-bedroom unit with Kavanaugh at Yale, claimed it was common knowledge that the phrase was sexual in nature.

"Those words were commonly used, and they were references to sexual activities," Roche said on CNN recently. "If you think about the context in which you might hear those words, the way that he described [how] they are defined and the way they are defined, they’re not interchangeable."

He further added that he heard Kavanaugh and his buddies talking about "Devil's Triangle" and "boofing" "regularly."

"I think that contributed to some of my feelings about the fact that these guys treated women in a way I didn’t like," he added.