someone who is overly heavy, looks like they eat a double baconator combo for every meal while chugging down a triple chocolate fudge milkshake
look at that big-backed, bulbous, earth-shaking, gravity-emitting, biggie, planetary-like fatty over there (it's the mirror)
Fatty (sometimes spelled" phatty") is a contraction of the phrase, "fat minute" It can be used interchangeably with the original phrase.
"Bro we haven't hung out in a fatty, wanna grab a drink tonight?"
A derogatory word describing someone who is morbidly obese or fat.
John : AHAHA, MADISON A FATTY
Teacher : You shouldn't say that