The term shouted when you charge another player in Call of Duty 4 and persist to stab (or the badass melee) them in the back, front, or head area.
Hey Josh did you see how that noob from Call of Duty 4 tried to sneek up behind me, but I turned around and shouted Sha-shaisha as i stabbed him in the neck meat.
by T Mass January 11, 2008