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
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!
my foot!used to express strong contradiction or disbelief. informal
...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!’
exclam. I do not believe it!; Like hell! (An exclamation of contradiction.) You’re the best in town, my foot!