my foot

my foot

An exclamation of disdain or disagreement. Busy my foot! I know he's lying just to get out of this commitment he made.
See also: foot
Farlex Dictionary of Idioms.

My foot!

Inf. I do not believe it!; Like hell! (An exclamation of contradiction.) Your prices are the best in town, my foot! I know two places cheaper. She's going to marry you? My foot!
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

my foot!

used to express strong contradiction or disbelief. informal
Farlex Partner Idioms Dictionary

...my ˈfoot!

(informal, humorous) a strong way of saying that you disagree completely with what has just been said: ‘Ian can’t come because he’s tired.’ ‘Tired my foot! Lazy more like!’
Farlex Partner Idioms Dictionary

My foot!

exclam. I do not believe it!; Like hell! (An exclamation of contradiction.) You’re the best in town, my foot!
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • My foot!
  • fleet of foot
  • foot it
  • be hand and foot to (one)
  • on foot
  • foot up
  • shoot oneself in the foot, to
  • foot
  • set foot in
  • set foot in (some place)
References in classic literature
But this man went on laughing and talking, while at every step the stone became more firmly wedged between my shoe and the frog of my foot. The stone was sharp on the inside and round on the outside, which, as every one knows, is the most dangerous kind that a horse can pick up, at the same time cutting his foot and making him most liable to stumble and fall.
Whether the man was partly blind or only very careless I can't say, but he drove me with that stone in my foot for a good half-mile before he saw anything.