The British Idiom – My foot
Definition of My foot
To say “My foot!” is to say, “I don’t believe that” or “That is definitely not true”. It’s an informal idiomatic expression that is normally only used in the spoken form.
Examples of Usage of My foot
Sale prices, my foot. Some of those shoes were cheaper last month. Honest, my foot. He’s a politician, for god’s sake.
Now watch my YouTube video English lesson which contains this British English idiom.