jag \'jag\ n - 1. Used to describe a large amount of any one thing; "Buddy's got some nice jag o' wood piled up fer next winter." See also: feed, whack. 2. A state of intoxication, usu. by alcohol, and suggestive of a prolonged and intensive spree; "Aubrey's been drinkin' heavy for three days straight - he's on a real good jag." See also: rightoutaver.