Doing something that can be considered funni like completing a hard challenge or winning a luck-based tournament.
After winning a game of Mario Kart against top players, he said he did the funni.
As he was speedrunning Super Mario 64 and was on world-record pace, his chat was saying that he was doing the funni.
A present tense term for when a comedian / entertainer is putting in a particularly good performance. Opposite of "is don't funny"
Yay!! John Voce in Miranda is do funny. Brilliant.