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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
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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
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Trading half of something you have with half of what another person has.
Person1: "Hey, let's half caff!! Can I have half of your cookie?"
Person2: "Sure, if you give me half of your drink!"
Person1: "it's a half caff!!"
by Natnah July 11, 2016
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