Also known as: 太った男, BBM
A man who is Fat: he that has a larger than normal amount of body fat. Frequently protrayed as lecherous in NSFW works.
Not to be confused with the real life Fat Man (Bomb) atomic bomb, the fictional Fat Man (Fallout) portable nuclear bomb from the Fallout series, or the character Fatman (Metal Gear) from Metal Gear Solid 2: Sons Of Liberty.