Verb- To negadibs someone is to publicly exclaim that there is no way in the worst of situations that you would ever contemplate the thought of even looking at this woman for fear of your dick turning to pure stone. To enact a negadibs you must yell, "negadibs!"
Negadibs to noone in general- "yeah, and her dad is right there."
Elliott to dudes in stands- "hey are you that chicks dad"
Stands response- "No"
Elliott- "fuck you negadibs you are a fat skank and a liar on top of it all"