After taking the catch to dismiss Ravichandran Ashwin, a highly charged up Virat Kohli made a gesture with his hand, before putting his right hand, in which he held the ball, behind his body. The action appeared slightly similar to Ashwin flicking the bails behind him, without delivering the ball, to controversially run out Rajasthan Royals' opener Jos Buttler.

from Times of India https://timesofindia.indiatimes.com/sports/cricket/ipl/top-stories/ipl-2019-did-virat-kohli-taunt-ashwin-over-mankading/articleshow/69053041.cms