"Yo estoy gordo." Note that you only say gordo if you are male. You would use gorda if you were female.
Gordo means fat in Spanish as an adjective.If you are talking about fat as a noun, than it would be grasa.
No gordo
Gordo
su grasa
dedo gordo
cordo fue
estas gordo [thats a really mean thing to say] lol
You're not fat = Tu no eres gordo/a (male/female)
You would say "guapa pero gorda".
que es la grasa
me estoy poniendo gordo
El chico es gordo