When somebody prevents you from eating a delicious sugary snack, usually a chocolately delight of some sort. Just like a cockblock except with chocolate.
I was going for the fudge sundae with ravenous vigor, but my wife chocblocked me at the last moment with some sort of gay speech about heart disease and diabetes. After 13 years of marriage you would think she would want me to die to get the life insurance money. Dammit.