To be hopelessly caught in a destructive, pointless, ego-centered argument about something that's been argued about before, usually with someone with whom you're close to.
"Don't be so pabsy!" (Said by someone listening nearby trying to break the tension by distracting the arguers to jolt the situation back to normal. A 'never mind' type hand motion emphasizes the word 'pabsy'. The more humor in the performance the better.)