From Longman Dictionary of Contemporary Englishjagjag /dʒæɡ/ noun [countable] → crying/shopping/talking etc jag
Examples from the Corpus
jag• I had an incredible crying jag.• I hadn't been alone on this drinking jag.• Then, realizing there was no point in trying to get up, she started in on another giggling jag.Origin jag (1600-1700) jag “small load” ((16-19 centuries)) 