Because it is the first to grow.
chinny chin chin
It is a nonsense phrase from a nursery rhyme that just means "no." It's "swearing" by the wolf's beard (the hair on his chin).
Shave it off or get laser hair removal.
you have to be old enough
Licking my balls
bell
shave
Shave it off or get laser hair removal.
tinware, twin flare, chin hair, thin hair,
Just one and you could also dilute the dye with conditioner.
bristle
Beard hair is on your chin. Usual hair is on the top of your head.