adj: between sober and falling-down drunk (guess based on context). Subject has consumed some
alcohol, is buzzed, rowdy, having a good
time.
heard in the raunchy, bawdy performances of John Valby a.k.a. Dr.
Dirty, usually performed live at bars.
Oh, you guys in the second set are half in the
bag, you can't remember shit. (when the audience forgets
new lines of a singalong)