What are some good funny clever insults for my ex boyfriend?

my ex boyfriend has recently started bashing me online, and i would like some great insults please. i have already been on 101insults and it wasnt really that good. if he can be childish, so can i. and it cant be about his di** because we never had and ive never seen it. hes a really nerdy looking guy, and hes a loner and has basically no friends. he has a fantacy about hypnotising a girl to do things to him, i dont know if that helps you get ideas. im totally pulling a blank on insults lately. And if your just going to say ' just walk away and ignore it, thats the best kind of insult' dont bother because ive already decided that this is childish and ive also already decided that i dont care. kthx (: