The portion of the body where the upper buttocks meet the hips.
Dude, Carmen Elektra has bangin' ass shoulders. I'd fuck that shit.
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Being overly defensive, obnoxious, confrontational, or just generally annoying.
Man, you've really got your ass on your shoulders.
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This is usually referred to someone who is stuck up or arrogant.
"I wish Mike would get his ass off his shoulders and admit he was wrong for tea-baggin James while he was sleep!"
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