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The phrase "your ass" is used as pronoun
(lemmy.ca)
Sometimes we have those little epiphanies in the shower.. sometimes they come from other places. This is a home for those epiphanies.
Personal pronouns are basically words performing as placeholder noun phrases. So it isn't surprising they can be replaced with actual noun phrases in some situations.
Not all, though. Or at least ~~I don't think so~~ my arse doesn't think so.