noun the external female genital parts. Originally recorded (1887) as a word for 'a fool'; this sense survives in the bawdy song 'The Mayor of Bayswater' (to the tune of 'The Ash Grove'): 'One black one, one white one / And one with a lump of shite on, / The hairs on her dickey-dido hang down to her knees' UK, 1984