It has not been confirmed who the group were discussing but the exchange appears to refer to Trump who gave an unscripted 50-minute back-and-forth press conference alongside the Canadian Prime Minister on Tuesday evening.
In the video, Trudeau can then be seen reenacting the surprise on the faces of Trump's press team when the President spontaneously revealed that the G7 summit would no longer be held at a Trump resort but at Camp David.
"You just watched his team's jaws drop to the floor," Trudeau continued, imitating their shocked faces.
After learning of Trudeau's not-so-private conversation, Trump later told reporters: "Well, he's two-faced."
In a move which only proved he was perhaps a little hurt by Trudeau's comments, Trump revealed via Twitter that he had cancelled any further meetings.
"....When today's meetings are over, I will be heading back to Washington," the 73-year-old wrote. "We won't be doing a press conference at the close of NATO because we did so many over the past two days. Safe travels to all!"