A new caffeine craze is sweeping cafes and it's the weirdest yet Labelled 'bullet coffee' or 'fat black', it can be found at trendy food stores The combined ingredients are said to make it 'breakfast-in-a-cup' With the array of macchiatos, lattes, cappuccinos, Americanos and mochas already on offer at High Street coffee chains - not to mention all the milks, shots and syrups you can add to them - you might have thought that every coffee craving was already covered.