"person 1 : "are you excited about the start of season 5 tonight?"  person 2 : "oooooh yeah, jack's back baby, jack's back
a term used to signify the return of 24, featuring the legend that is jack bauer
""person 1 : "are you excited about the start of season 5 tonight?"  person 2 : "oooooh yeah, jack's back baby, jack's back" What is the definition of "jack's back"?