Does saying "divorced, divorced" as a joke, without the intention of divorce, constitute a divorce, or is expiation required in this case?

If the divorce is pronounced explicitly, it is considered valid whether serious or in jest, based on the Prophet's (peace be upon him) saying: "There are three matters, which, whether done seriously or in jest, are considered serious: marriage, divorce, and revocation." Your explicit pronouncement of divorce, not attributed to the wife, is a matter of scholarly disagreement, and the more likely opinion is that it is a metaphorical expression (kinayah). One must be cautious about uttering divorce, as it is a solemn covenant. Allah, the Almighty, says: "And do not take the verses of Allah in jest."