Disbelief, or calling someone a liar.
Kensi: I found a very easy Martha Stewart snickerdoodle recipe online.
(Deeks finds a plastic box for snickerdoodles as Kensie leaves)
Deeks: Martha Stewart my ass!
by DarthKieduss December 19, 2013
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A way of expressing disbelief. It seems to be derived from the expression "my eye!" which just wasn't vulgar.

Also used in comparison to something being described as the superlative worst.
"Single he told me? Single my ass, he had six wives. One of those Mormons, ya know?"

"I R 1337"
"My ass is 1337er than you."
by junkyardprince October 14, 2003
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The biggest, chunkier, marshmallow like, and fat thing in the multiverse. It's so strong that even thanos with the infinity gauntlet it cant do anything and its also is ant man proof.
by The Mica April 03, 2019
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An expression used i n times when you find that whatever someone is saying is complete bullshit.
"My ass, your not taking my last Mountian Dew"
by The World's Vampire June 26, 2003
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Exclamation of surprise, amazement or frustation. Similar in usage to Aussie "Fuck me dead"
I finally passed my finals...Clog my ass that is awesome!

Clog my ass, I've just missed my train!
by HansSausage August 10, 2020
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The experience of having a person, most likely driving a large truck or SUV with their high beams on, tailgating you at night when you are clearly exceeding the posted speed limit.
Dude, this chode was riding my ass the whole ride home even though I was going 20 MPH over the speed limit!
by JerryTurnpike May 31, 2014
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