uses for presumably rotten brown beef that disgusts you upoon looking at it

Even good beef can turn brown due to lack of oxygen. If the meat is not very old and has been wrapped in an airtight container, this is likely the situation. If you expose it to air and it turns red again, you're home free.

If the meat is old and either smells or doesn't turn red, then wrap it up tight and throw it away immediately! Put it in a Dumpster or outdoor trash barrel. Bury it. Throw it in the street (or in a river, or on train tracks). Put in in an enemy's car when he or she is not looking. Make a fragrant and ephemeral pincushion.

ok i was told beef turned brown BECAUSE of oxygen. yr right tho cuz this is actually an unopened package. its still really disgusting & i have to suppress my gag reflex upon looking at it so im tossing it out now

Beef that's been hung properly is often brown. Trust your nose and not what you've been taught by supermarkets about fresh meat being scarlet.

If the beef's been ground, however, and is gray-brown, slimy, and smells rancid, just throw it out for gods' sake.

it wasnt grey-brown but it was brown & so disgusting to look at i threw it out anyway

it seriously made me want to puke whenever id reach for a soda or beer or something, i had no choice

The nose knows, and all that.