Words I'm Looking Up (One in an occasional series on words I'm looking up)

coprolalia

n. The uncontrolled, often obsessive use of obscene or scatological language that may accompany certain mental disorders, such as Tourette's syndrome. -- American Heritage Dictionary

Root: Greek "lalia," meaning "babbling" or "meaningless talk"

Prefix: Greek "copro," meaning "dung, excrement, feces"