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.
by Mary Mary Quite The Contrarian November 5, 2020
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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.
by socialexample January 26, 2011
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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.
by khela hobe April 3, 2019
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