My uncle and aunt run a Whiskey specialty store in Haarlem and were often asked whether they also sell a typical Haarlem souvenir drink. This gave them the idea to create a real Haarlems drink. With coffee beans from Haarlem, a distillery from Haarlem and of course a typical Haarlem name.
The name 'Mug' (Mosquito) comes from the nickname given to people born in Haarlem. Kiss (Kus) stands for the sweeter variety and bite (Beet) for a slightly spicier taste.