[Master]

could it be possible that a person can be so fat that they can have their own gravitational orbit

[Alloy]

No. You're all fuckking dumb!!!!!

[Donald J Trump]

Yes it is possible, but however at that point of fattness. They would be competing with the moon for weight

[Supa]

actually every mass has a gravitation field, no matter how big or small. But the amount of force of the gravitational field is determined by a number of factors. To have an orbit the mass being pulled into the main mass's gravitational field must be smaller and also project a strong force itself.

Basically you have tiny molecules and atoms orbiting your body 24/7.

Which in turn means you're monstrously obese.

[Heat]

Everything on this universe have their own "gravitational orbit". A part of the hybridization theory says that if you have X element with his higher orbital unpaired, that element will attract electrons to complete the last orbital (magnetic properties).

If you have a lot of elements with these characteristics, you will have a big "body" that could attract considerable matter. One theory of the earth origin is based in that shiz.

Maybe a fat man could not attract considerable matter, just little things that the human eye can't see. You must think on the chemical human composition in comparison of a planet. Almost all the rocky planets are composed by Silicon and Iron, elements that can attract other elements and create a big and solid mass.

And finally, a fat guy explodes before attract mass lol

Sorry for my bad english, I could give a better explanation in spanish if you want.

EDIT: Send the fat man nude to the north pole. Every last orbital of his body will lose energy and go down one energy level, then the last orbital won't be paired and could attract mass :v

[SmG Blade]

G = Gravitational Constant = 6.67 x 10[sup]-11[/sup]
M[sub]f[/sub] = Mass of Fat Man (If his weight is 100 Kg according to earth then his mass will be 10 Kg {weight/grvitational acceleraton of earth})
R[sub]f[/sub] = Radius of Fat Man

Now put these things in - (G × M[sub]f[/sub]) / (R[sub]f[/sub])[sup]2[/sup]

You get the Gravitational Attraction...

[SmG Phoenix]

could it be possible that a person can be so fat that they can have their own gravitational orbit

Pretty much, everything has its 'gravitational orbit' no matter how big or small they are. It comes down to how big or small that particle is though.
If you mean orbit in reference to planets. Then no.