1. To describe someone and or something observed as small and or insignificant, often used to describe tastes quite the opposite of your own.
2.(a) As humans are intended to have long hair as observed through a natural perspective, the word grannual is used to describe someone with short hair.
Grannual is quite often used to describe the short and neat appearance of a metro-sexual persons hairstyle, though it is also used to describe hairstyles of many other varieties.
(b) To describe a neat and cleanly shaven and or well kept individual.
3. To describe unwanted "ingredients in one's meal and or drinks.
"You're such a grannual"
"That person looks like a major grannual"
"I believe I have a grannual in my drink"