Not sure of the context, but is this a reference to the sound stage where Hayate gropes someone? I've never heard it, but this might make sense if they're fighting over someone else's breasts.
I'm not sure why they'd be up in arms over who gets to touch the others' breasts when they could just both touch each others'. Makes more sense to me if they're fighting over a third party's breasts (i.e. Nanoha or Teana).