contrary to popular belief the term 'fat knacker' is quite often used to insult someone who is not actually fat. But who is stuffing their amply sized gob full of something a fat person would eat.
Implies that they get knackered whilst eating hence the term fat knacker.
Also can be used to describe someone who is just insanely fat and gets tired shuffling to the fridge.

(note: i have absolutely nothing against fat people, the term fat knacker would only be used (in my case) to describe someone fat and a total ass wipe)

a penis with a lot of girth

Another way of saying good or big. Can be used on its own or as an intensifier.

Originates from the cult cartoon short film Super Mario Långben: Cp-Dinosaurien (Super Mario Goofy: The Retard Dinosaur), in the line "I'm kicking fatting popcorn."

The permeating aroma that tends to smell of sweat, arm pits and ass that surrounds an overweight person.

when you're not really fat, but you're fat for a classically trained dancer.

He's bulking

Fat dude that thinks he's cool because was on the football team for awhile and he cheats on girls. Recently he enlisted in the marines because he's a wannabe jock badass. he also used to be a dork.