I did a little digging. The heat of decay (so plutonium 238 just sitting around, not burning) is about .48 kcal/hr per gram. So if we were able to convert that energy to ATP like we do carbohydrates, eating about 300g of plutonium would be like eating a twinkie (150kcal) every hour. In about 88 years the energy output of that plutonium would have reduced to about a half-twinkie per hour.

Assuming you need 2000 kcal per day to maintain weight, that’s only 83 kcal per hour needed. So, if you could survive eating it and actually utilize the energy generated, you’d be set for life on food after eating less than 300g. We’d have to come up with a dosing schedule or you’d have to work out pretty hard as a young person to keep from getting fat.

The heat of combustion for plutonium based on a very cursory search (take it with a grain of salt) is about 1 kcal/g. So assuming your body could oxidize it, you’d get a one-time burst of about 2 twinkies worth of energy immediately upon eating that 300g.

(Different definition/pov of what is measured, yes, that is where the joke is.)

Hehe, look at this falsehood - there is no way this things can talk!
(However imho this is a more clear example of 'two different definitions' of the main concept/phrase inferentially mixed together for comedic effect, bcs words can explicitly have more than one meaning, and yes, usually you can tell from the context.)

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This pic is def:

This "fun fact" mixes up the two definitions, making the statement meaningless.