Definition of mickeys:
(n) :
(chiefly Canada, informal) A small bottle of liquor, holding 375 ml or 13 oz., typically shaped to fit in one's pocket.
(n) :
(US, slang) A Mickey Finn; a beverage, usually alcoholic, that has been drugged.
(n) :
(chiefly Ireland, informal) The penis.
(n) :
(Australia, New Zealand, Ireland, informal) The vagina.
(n) :
(computing) The resolution of a mouse: the smallest measurable distance it can move the cursor, used as a unit of length.
(v) :
To secretly slip drugs into somebody's drink.