(US) gaiety, liveliness.
|Amer. Thes. Sl.|
|Gourmet Jan. 18/2: No party got into full swing until Tallulah arrived to put her particular type of zizz into it [OED].|
|Times 22 Feb. 12/6: The Queensgate centre lacks, perhaps, finesse and a touch of zizz.|
|Guardian 28 Mar. 22: Gilbert and Sullivan’s career is delightful. (If you have a little zizz).|