A mustache with ends that hang downward toward or below the chin.
A mustache that droops down along the sides of the mouth, usually to the chin or below.
A full, straight moustache that grows downward past the lips and on either side of the chin and extends down toward the toes.
Origin of fu-manchu-mustache
After Fu Manchu , character in novels by Sax Rohmer, pen name of Arthur Sarsfield Ward (1886–1959), British mystery writer