Fat Muscle 

A person whose body is made of or looks like it is made up of both equal parts of Fat and Muscle.

Timberland is pure fat muscle, You can't tell where the fat and muscle begins or ends on his body.

Fat Muscle by sctrjrzoetics January 28, 2010

Fake Fat Muscle 

The phenomenon where a person (usually dude) who might appear somewhat athletic or muscular at a cursory glance... but upon closer inspection, you see they have no muscle whatsoever, and instead, have fat that lays in such a way that deceptively makes them look pseudo-muscular. Similar to how "skinny fat" people aren't really skinny, Fake Fat Muscle people aren't really muscular.

There are several proofs to this: 1) the person has no vascularity, or even any actual muscular development, and if they were to flex or strain or lift a weight, they still don't actually look different. Why would they? It's all just fat. There's no muscle there to flex.
2) The person doesn't actually workout. Sometimes they go to the gym, but it's a pretense. Their workout amounts to nothing. They could instead lay on the couch and they would have the same end result appearance. Fake fat muscle types are at most, weekend warriors.
3) Similar to skinny fat and ILS (imaginary lat syndrome) this person is presenting themselves dishonestly, and in keeping with that, they'll often wear either tank tops, muscle tee, or shmedium T-shirts to try and accentuate their fake fat muscles.

These pretenders shrink in the presence of real men, and usually do a subtle scurry out of the gym when the real lifters arrive, so as to not be exposed as frauds by comparison.

I thought that dude had a decent physique until I took a second glance and realized it's all fake fat muscle.

Fake Fat Muscle by Too Many Drones May 24, 2019

fatmuscle 

abbreviation of:

For All The Many Single Chicks Longing Excitement

big erections

fatmuscle by john March 27, 2004