[Concrete3286]

Seems like a reasonable definition? It's not referring to tissue you put through a grinder yourself.

From wikipedia:

Mechanically separated meat (MSM), mechanically recovered/reclaimed meat (MRM), or mechanically deboned meat (MDM) is a paste-like meat product produced by forcing pureed or ground beef, pork, mutton, turkey or chicken under high pressure through a sieve or similar device to separate the bone from the edible meat tissue. When poultry is used, it is sometimes called white slime as an analog to meat-additive pink slime and to meat extracted by advanced meat recovery systems, both of which are different processes. The process entails pureeing or grinding the carcass left after the manual removal of meat from the bones and then forcing the slurry through a sieve under pressure.

The resulting product is a blend primarily consisting of tissues not generally considered meat, along with a much smaller amount of actual meat (muscle tissue).

[UncleMeat]

But what's the issue? I can eat beef and beef tendon separately but if they are blended together it suddenly becomes bad?

[alkyon]

Mechanically separated meat is a marketing term. It's neither 100% meat (in fact it contains tons or fat and joints) nor a good quality meat (this one is sold separately). I don't buy any products that list it among its ingredients.

Ground beef its not the same thing

[emchammer]

Disgusting and disrespectful to the animal.

[UncleMeat]

If we are going to kill an animal to eat it then we should use all of it.