From Longman Dictionary of Contemporary Englishsomebody is just foolingsomebody is just foolingspokenSERIOUS/NOT JOKING used to say that someone is not serious and is only pretending that something is true syn somebody is just kiddingDon’t pay any attention to Henry. He’s just fooling. →fool
Examples from the Corpus
somebody is just fooling• Don't pay any attention to Henry. He's just fooling.