How would someone explain Toon Force/make a toon force ability scientifically plausible?

When I say toon force, I mean the ability to manipulate your body and the laws of physics like that of a cartoon character and I mean popeye or looney toons level of cartoonish. How would one explain or create an ability like this in a sci-fi setting with real world physics/science in a way that sounds scientifically plausible?

A possible solution I have with this is making the user's imagination into a governing law of the universe that overpowers all other laws of physics, but what explanation or mechanics for this ability would you give?