Noun, the phenomenon where the drinker (typically of whiskey) crosses the line between amiable drunkeness and becomes a miserable
fucking cunt.
Or
The name given to the
metaphorical chastity belt imposed by a normally sexually generous woman in response to outrageously drunken conduct.
Mark, "I got so cunted last night I crossed the whiskey barrier and became so fucking
depressed I could have cut my own head off if I was not so uncoordinated."
Or
Barry, "I'll just have just the one tonight, I am feeling
fucking horny and I
don't want the missus to drop the whiskey barrier like last time."