The art of impersonating Joey Deacon, popular in British playgrounds in the early 1980s following the 1981 Blue Peter appeal. Includes sticking the tongue under the lower lip, thrusting it forward, contorting the arms, and grunting Mmrumm nrgugh urhmmh mrulhh ugh and so on. Often used to exaggerate the effect of insulting someone by calling them a Joey or alternatively Deacon.