in slang, a mickey finn (or simply mickey) is a drink laced with a drug (especially chloral hydrate) given to someone without their knowledge in order to incapacitate them. serving someone a mickey is most commonly referred to as slipping someone a mickey, but it is sometimes spelled "mickie". == history of term == ===michael "mickey" finn=== the mickey finn is most likely named for the manager and bartender of a chicago establishment, the lone star saloon and palm garden restaurant, which operated from 1896 to 1903 in the city's south loop neighborhood on south state street.the saloon's exact location is usually said to be the on west side of south state street, just north of congress parkway. the entire west side of south state street, between congress and van buren, is now occupied by chicago public library's central library (also known as the harold washington library at 400 south state street). the december 16â17, 1903, chicago daily tribune articles give the address as 527 state street (corner of state and harmon court), however, which is now the 1100 block of south state street. the 500 block of south state street now is between congress street and harrison street, which may be the reason for the confusion of the saloon's location. for the 1903 chicago street names and numbering refer to "new map of chicago showing street car lines in colors and street numbers in even hundreds", chicago : rufus blanchard, 1897.the area on state street centered between van buren street (to the north) to harrison street (to the south) was known as "whiskey row" from the late 1880s to the early 1910s. just south of harrison street was a block known as "hell's half mile". the area of state street, south of harrison was also known as "satan's mile". in december 1903, several chicago newspapers document that a michael "mickey" finn managed the lone star saloon and was accused of using knockout drops to incapacitate and rob some of his customers.. quoting from the article, "michael finn, owner of saloon at corner of state street and harmon court [now east 11 street] ... two former habituÃ©sâmrs. mary thornton and isabelle fyffeâtold that he gave 'knock-out drops' to customers suspected of having money and afterwards robbed them." mary thornton is quoted, "i worked for finn a year and a half and in that time i saw a dozen men given 'dope' by finn and his bartender. the work was done in two little rooms adjoining the 
Drugs English-language_slang History_of_Chicago,_Illinois