my foot
US /maɪ fʊt/
UK /maɪ fʊt/

1.
鬼才信, 胡說
used to express strong disagreement or disbelief about something that has just been said
:
•
He said he's a genius. Genius, my foot!
他說他是天才。天才,鬼才信!
•
You think that's a good idea? Good idea, my foot!
你覺得這是個好主意?好主意,鬼才信!