I need help, so could u plz help me?

Ok there's this boy that really gets on my nerves cause he always says mayonaise to me which is annoying, and he always says to me it's Billie's fault and he can't say that cause I made it up and he is such a jackass!, one of these days, I'm gonna pounce on parte superior, arriba of him and start punching him 10,000 times in the face, so the siguiente time he bothers me what should I say insted of saying, stop it o whatever?