Idiom commonly meaning "a touch off," but frequently used to mean "not quite straight" when referring to an individual's sexual preferences. Largely used in small towns and rural areas.
"Considering he grew up wearing ladies' clothing and carrying purses, everything assumed Joe was half a bubble off plumb, so we were shocked when he came back to the reunion with a wife last summer."
by Tell Major Hawks February 05, 2014
buy the domain for your cat site