A common phrase used when a male is trying to finger a female and the male goes to low and touches her asshole and the female exclaims, “Thats my ass.”
“That’s my ass” she told him and he moved his hand away from her asshole.
by Garrett Wick August 26, 2018
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When someone says something and you think it’s a lie. / You don’t believe in what they’re saying
Person 1: Me and name are in a relationship

Person 2: Relationship my ass
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Product of an owl and a bungee cord. (See Kung Pow for reference)
What do you get when you cross an owl with a bungee cord... MY ASS!
by Anonymous June 25, 2003
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A statement of defiance or a derogatory term expressing surprise, disappointment or irritation. Usually used when someone tells you something that you just honestly can't or won't enjoy.
“The fact you have to face is that you inadvertently killed two psyker brothers with your presence. This is why we decided that the Culexus Temple would be the best place for you,” He (Briar) explained.

“Culexus my ass,” Marcella rolled her eyes, “I’d rather be back home on Epsilon Regalis, or serving in Escholan’s retinue.”
by LyassacheckList August 12, 2016
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The best thing you can say to someone when they offend you
Guy 1: you r so ugly
Guy 2: ugly my ass
by Your friend next door down March 19, 2019
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Humorous/sarcastic answer or explanation for any question one doesn't really care about.
Teacher: Now, students, can anyone tell us the difference between an electron and a positron?
Me: My ass.

Mom: Why did you cover the cat in gravy and throw him over the fence into the neighbor's yard?
Me: Because my ass.

Doctor: You jumped off the roof of your house onto a tricycle? What were you thinking?!
Me: My ass.
by Hellzapoppin' July 12, 2018
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When someone says something and you believe that it’s a lie/ you know it’s a lie.
Person 1: me and name are in a relationship
Person 2: relationship my ass!
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