It's a metaphor for saying that one's body is sacred, and so one should treat it well and with respect, as you would to a sacred temple.
The phrase is usually used to justify one's sense of self-respect (dignity), and to express their discontent towards lending their body for other people's gain (or for monetary gains).
Example 1:
Cheeky guy: Hey beautiful, your body is so enticing, you should totally become a model for some magazine 😍
Her: Nah, my body is a temple, I prefer to keep it clean thank you.
Example 2:
Girl friend 1: Hey why are you taking pictures of your feet?
Girl friend 2: Oh it's for only OnlyFans followers, they pay big bucks to see my feet! You should totally join too and we can make cash together!
Girl friend 1: No thanks, my body is a temple.
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An excuse to eat shit food and feel fine about it.
Jack: That's your fifth slice of pizza
Sally: My body is a temple!
Liz: I ate cake for breakfast and chips for lunch, but its okay because my body is a temple.
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an excuse to feel okay even though you are fat fuck, exaggeration to let other think you are okay while its clearly not.
Don't tell me what to eat my body is a temple
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