A nerd with an odd but unmistakable air of cuteness about him/her. The traits of a nerdball are the same as those of a normal nerd, but are somehow endearinginstead of irksome.
Girl A: "OMG last night with Jake was terrible!"
Girl B: "Why what happened?"
Girl A: "He has nonoballs! I couldn't feel anything the whole time we were having sex."