While the 42-year-old rapper did not specifically used the word marijuana in his answer, he took a drag of something that looked like a marijuana joint while explaining the situation to guest Jimmy Kimmel.
Dogg's comments came after Kimmel asked him if he had ever smoked in the White House.
"In the bathroom," he explained. "Not in the White House -- but in the bathroom. Because I said, 'May I use the bathroom for a second?' And they said, 'What are you going to do? No. 1 or No. 2?' I said, 'No. 2.'"
"Who said this? The first lady?" asked Kimmel.
"No. The CIA. Or the FBI. The alphabet boys. So I said, 'Look, when I do the No. 2, I usually, you know, have a cigarette or I light something to get the aroma right.' They said, 'You know what? You can light a piece of napkin.' I said, 'I'll do that.' And the napkin was this [he indicates blunt]."
The Washington Post points out that Dogg -- real name Calvin Cordozar Broadus, Jr. -- was in fact at 1600 Pennsylvania Ave "ahead of the Kennedy Center Honors in December."
Marijuana is not legal in the District of Columbia.