"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.
Gordo
No gordo
su grasa
cordo fue
dedo gordo
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".
me estoy poniendo gordo
que es la grasa
El chico es gordo