Questions about example sentences with, and the definition and usage of "Buttocks"

A: backside, or bum, or butt

natiche, culo

A: Buttocks, bum, butt, and ass all refer to the same thing. It's the body part you sit on. Hips are the bones on each side of your waist.
The word buttocks is not used often, so for your example I would say butt or bum. Saying ass can be considered rude.

A: ちょっと変ですが…。😅 "He was staring at my shapely buttocks." "My shapely buttocks come from bicycling to work every day."

A: The gluteus muscles are in the buttocks. The buttocks are the whole area, including muscle, fat, and skin.

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A: people normally just say butt in america but there is a lot of slang work for them as well

A: × I fell on my buttocks this morning.
✓ I fell on my butt this morning.

× I got my new white shoes dirty when I fell.
✓ I got my new, white shoes dirty when I fell.

A: Who and and what situation would say buttocks ?

A: It was in the news that Smugglers were smuggling cocaine in fake buttocks transplants.