The gif of Ranveer Singh dancing among Maratha soldiers is taken from the video Malhari from the movie Bajirao Mastani.
The gif from Malhari has become a popular ‘celebration’ among the reddit and especially the bitcoin community. As /u/Oracle_of_Knowledge mentions in this comment
On Bitcoinity.com when there is a new milestone All Time High they will often post a gif. A gif of this (1:26 in the video, his re-entrance) was up on Bitconity for the $4000 USD all time high. I think that was the first occurrence that I ever saw of it.
Check out some of the popular memes on the topic:
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