Senses
牛溲马勃/ 牛溲馬勃 cheap but useful
(idiom) things that appear low in value or common but are useful if used correctly, referring to cow urine and horse-puffball fungus being used as medicine
牛溲马勃/ 牛溲馬勃 worthless nonsense
(idiom) things of no value; insignificant items