To leave an uncomfortable place or situation, usually because someone is causing drama, bullshit or is just being annoying. Often used when someone is being frustrating enough to warrant a departure, but quite enough to justify an ass-kicking.
Guy #1: My girl is sweet, I love her so much, like... when we're together, it's perfect!
Guy #2: Dude, if you're just gonna mouth on about your feelings, I'm gonna bail. Fuck that. I don't want to hear that shit.