A Jiss Missile is when you you put a funnal around youre cock at youre climax and aim it at youre partners mouth so the jizz will shoot direckedly at there Uvula to cause them to gag from the amount of jizz shooting into there throat.
Jack "Yo did you here bode gave shaquein a Jizz Missile"
Erica " no way I want someone to Jive me a Jizz missile"