A mix of coffee that is half caffeinated and half decaf, which is primarily consumed by middle-aged women when they are not drinking white-wine spritzers.
"I'll have half caff, please," said the 35-year-old cat lady with bags under her eyes, to the strapping young barista.
Mainly used to describe a half caffeine half decaf coffee,but it this case it refers to a half black half white child.
Look at that kid he has a black dad and a white mom, he must be a half caff!!