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.
by Gravydog July 12, 2011
When a man's penis is not quite a full boner yet not quite limp either. Essentially the Goldilocks zone of penial stiffness.
Do you see that bulge in that man's pants? He must have the half caff.
by Young Raspberry Milk October 27, 2015
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!!
by DallasMia August 09, 2008