Itchin' for a bitchin'

A phrase used either to describe one's own feelings (i.e. annoyed by somebody and wanting to gossip) or feelings about somebody else (i.e. feeling that somebody deserves to be gossiped about)

Girl 1: "You okay? You don't look very pleased."
Girl 2: "Grrr. They are really pissing me off. Are you busy tonight? I'm really itchin' for a bitchin'."

Girl 1: "Listen to her! I can't believe she just said that to Max! Wow, that girl is really itchin' for a bitchin'."