my ass
1 of 2phrase
—used as an impolite way to express distrust or disagreement
"Unconscious mind, my ass," she said. "Get over it."—
Mary Karr
The bus driver stops him at the door. But he's fifteen, says the boy. My ass, says the driver.—
Daniel Alarcón
chiefly US, informal + impolite
—used to indicate that what has just been said is nonsense
"You think your job is tough work? Tough work, my ass! My job is the tough one."
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Merriam-Webster unabridged



