"I know where she went -- it's disgusting, I don't want to talk about it," Trump said, screwing up his face, as the crowd laughed and cheered. "No, it's too disgusting. Don't say it, it's disgusting."
Later in the night, Trump told the crowd that he could not picture Clinton as president because she never wins at anything. He then brought up the 2008 Democratic primary, which Clinton lost to Barack Obama.
"She was favored to win, and she got schlonged," Trump said, turning a vulgar noun for a large penis into a verb.
Trump has repeatedly faced criticism for the language that he uses to describe women, including his female rivals. During the first GOP debate in August, Megyn Kelly of Fox News brought up some of Trump's more controversial comments and asked him: "Does that sound to you like the temperament of a man we should elect as president, and how will you answer the charge from Hillary Clinton, who was likely to be the Democratic nominee, that you are part of the war on women?"
Trump has called that question unfair and launched a vicious attack against Kelly. During a CNN interview after the debate, Trump said of Kelly: "You could see there was blood coming out of her eyes, blood coming out of her wherever." Trump later said he meant to say "ears," but many assumed he was saying that Kelly was menstruating.
This isn't the first time Trump has attacked Clinton using phrases that some of her supporters have labeled as sexist. In recent weeks, he has repeatedly commented on her pantsuits, said she lacks the "stamina" and "strength" needed for the presidency, and accused her of sleeping too much. Clinton is 68, and Trump is 69.
This latest attack seems to be in response to a comment Clinton made about Trump during the Saturday night debate: She said that the Islamic State terrorist group has used video of Trump's controversial comments on Muslims to recruit new members, a claim that has drawn questions and skepticism from fact-checkers. Trump has demanded an apology, which Clinton has refused to give.
"She's terrible," Trump said during the rally. He then impersonated Clinton's comments at the debate, using a rather snotty voice: "Donald Trump is on video, and ISIS is using him on the video to recruit."
"And it turned out to be a lie -- she's a liar!" Trump said to roaring cheers. "And the last person she wants to run against is me."
Clinton was not the only woman mentioned on Monday night. Trump also said that Caroline Kennedy is too "nice" to be the ambassador to Japan and is no match for their "brutal, brilliant" negotiators. And he questioned why Time picked German Chancellor Angela Merkel as its "Person of the Year" instead of him.
"They gave it to a woman who has not done the right thing for Germany," Trump said, as the crowd booed Merkel. "Nice woman. I like her, I like her. I better like her -- I may have to deal with her. Look, hey, Putin likes me, I want her to like me, too."
Trump used that reference to Putin as an opportunity to chide the Russian dictator for allegedly killing journalists.
"I hate some of these people, but I would never kill them," Trump said of the journalists who cover him. "I would never kill them. I would never kill them... I would never kill them, but I do hate them. And some of them are such lying, disgusting people."
More than a dozen times, Trump was interrupted by protesters, including one who called him a "bigot." Late in the rally, a woman began screaming at Trump.
"Yes, darling? Yes?" Trump said to the woman, who was quickly escorted out. "Well, she doesn't sound very tough. That's a very weak voice. Go a little louder, we can't hear you, darling. Wow."