The word changes based on what you mean, there is fat as in "fat person" and then a noun used for various fats and oils.
Fats and Oils:
For this case you can use 脂肪 (shibou, fats/grease) or 油 (abura, oil).
Fat Stature:
In this case the word is デブ (debu). An example is デブになりたくない! (debu ni naritakunai) which means "I don't want to get fat!".
'Debu na neko' means 'fat cat' in Japanese. 'Futteita neko' can also be used.
ooki neko or if you mean fat cat: futoi neko
"Fat man" would be "futotteru otoko" in Japanese.
Shibou shitsu no roba 脂肪質のろば You fat ass in Japanese is=Anata wo shibo shiri あなたの脂肪尻
i gather you want to fight some one, unfortunately a lot of colloquialisms don't translate.
Fat man
.... WA futoi desu
'Debu na neko' means 'fat cat' in Japanese. 'Futteita neko' can also be used.
Anata WA debu.
fat ape shibo saru baby ape akachan saru
ooki neko or if you mean fat cat: futoi neko
"Fat man" would be "futotteru otoko" in Japanese.
the Japanese for 'fat' is 'debu' all vowels in the Japanese language are pronounced sharply so its said dehbu
Shibou shitsu no roba 脂肪質のろば You fat ass in Japanese is=Anata wo shibo shiri あなたの脂肪尻
Japanese Women Don't Get Old or Fat was created in 2005.
i gather you want to fight some one, unfortunately a lot of colloquialisms don't translate.
"_____"wa futo te imasu "____" is fat