They also say, "Alsof er een engeltje over je tong piest", which means, “it’s like an angel is peeing on my tongue.â€I'll let you decide if this relates to monkeys or not.
Speaker of European wrote:
The Dutch phrase "Nu komt de aap uit de mouw" means "The monkey is coming out of the sleeve," and is used to indicate a topic is becoming clear.
P.S. Dutch is what they speak in the Netherlands, which is also known as Holland. If you say they are speaking Hollandaise, they'll dump a mayonnaise based sauce on your head.