The state of being so angry that the colon will actually manifest and expell cute little kittens from the rectum. Usually used to describe someone's presumed reaction to an event or occurance.
"Man, the boss is going to shit kittens when he reads this report."
"Dude, your wife is going to shit kittens when she finds out you forgot about your aniversary!"
"My girlfriend shit kittens when I told her I thought she looked fat in those jeans."