What does the slang crackpot mean?
whimsically eccentric person
Dating from the late 19th century, crackpot combines pot, slang for "head," with crack, implying someone whose head is cracked.
Definitions of crackpot. a whimsically eccentric person. synonyms: crank, fruitcake, nut, nut case, screwball. type of: eccentric, eccentric person, flake, geek, oddball.
