( BrE , informal ) used to show that you do not believe what sb has just said
PULL THE OTHER ONE (—IT'S GOT BELLS ON)
Meaning of PULL THE OTHER ONE (—IT'S GOT BELLS ON) in English
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005