Owned by Captain America/Steve Rogers/Chris Evans. His suit in 2014 definitely did something for his ass. We love him. He is worthy.
America's Ass is defined in this snip-bit of the scene in endgame where Cap is seen in 2014:

“Mr. Rogers,” he (Tony Stark)murmurs into his headset. “That old suit design did nothing for your ass.” The camera stalls on Chris’s (Cap's) butt just long enough for Scott Lang (Ant-Man) to beg to differ. “You look great, Cap,” he reassures. “As far as I’m concerned, that’s America’s Ass.”
by hey_o_buddy_o April 30, 2019
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Steve Rogers' ass.

That's it. That's the definition.
"Cap, that suit did nothing for your ass."

"As far as I'm concerned sir, that's America's ass!"

*fights his own self* "That is America's ass..."
by ticklesquad May 2, 2019
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The ass of Captain America who represents America and therefore has the ass of America
Wow! America's Ass is swinging!
by The_Crimson_Chin April 26, 2019
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A quote that is said in Avengers: Endgame by Tony Stark and Captain America saying that Captain America has America's Ass
Tony Stark:"That's America's Ass!"
Captain America:"That is America's Ass!
Random guy:"Hey have you seen America's Ass?
by iGamearia May 3, 2019
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Captain America’s sweet, thicc, luscious ass cheeks; an ideal location for increased glycogen storage due to the supersoldier serum and the exercise he partakes in whilst kicking the vastly inferior asses of others; the muscular perfection of Steve Roger’s gluteus minimus, gluteus medius, and gluteus maximus; an exemplary example of dummy thicc buttocks; the area over which the super spandex of Captain America’s super suit where stretches the most; the only ass that was a recipient of complements from both Tony Stark and Steve Rogers in the movie Avengers: Endgame;

America’s finest ass, engineered by a german scientist to perfection.
Hrrrrnnggh Tony im doing whatever it takes but im dummy thicc and the claps of America’s Ass cheeks keeps alerting Thanos
by Thicc cheeky April 26, 2019
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Owned by Steve Rodgers (Captain America) / Chris Evans
THE ass of 2019 and probably 2020.

The scene where everyone in the cinema drooled, agreed with Scott Lang and saluted.
"As far as I'm concerned, that's America's ass." - Scott Lang
by TMI-lilly April 18, 2020
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