From Longman Dictionary of Contemporary Englishand another thingand another thingspoken used to introduce something additional that you want to say to someone about a different subjectAnd another thing. You were late for work again this morning. →another
Examples from the Corpus
and another thing• Oh, and another thing: Prices will go down, too, as much as three to five bucks per dish.• And another thing! Where's the fifty dollars you owe me?