Cossack Dance is an attack used by the Jack series of androids from Tekken 2 onwards, with the exception of Prototype Jack, who did not have it until Tekken Tag Tournament 2.
In Tekken 2, Jack-2 will laugh when performing the second kick, however the laugh is not present in later games, even when Jack-2 returns in Tekken Tag Tournament.
Doctor Bosconovitch has a variation of this move in Tekken 3, where it is called Dancin' Doc.