To wake up so hungover you can't decide if you need to shit or yack, that it's usually happens simultaneously.
"Man, I don't know If I have to shit or yack. I just shit-yacked."
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1. When a male is t-bagging a woman and before he ejaculates turns and shits on her face.
2. Also may be used as a way to express anger.
1. "Hey Bill last night Linda let me do shit-cock-yack balls, and it was fantastic."
2. "Shit-cock-yack-balls! I died in Call of Duty again."
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