In Brazil, it is a national cocktail, made with cachaça, sugar and lime.
In this case, caipirinha is another dance meme with various characters from different series. Their actions consist of wagging their finger and shaking their hips. Its Japanese name is "ぷんちきぱやっぱーヾ(゚∀゚)ノ♪ (punchiki-payappaa)."