1920s and 30s slang for a dildo or an item used as such. (Coke bottles were most common.)
Thought to be a misspelling (based on the African American pronunciation) of "derringer," a type of pistol.
Often used when referring to the "Fatty Arbuckle Scandal" of 1921.
I caught my girl pushing a darringer last night, so I guess she don't need me no more.