Beef is meat from a cow. It's also a word for a complaint. If you have a beef with someone, you’re not sharing a steak, you have a gripe. Just don’t beef to a cow; her problems are worse.
Beef is a type of meat from cattle. If you've ever had a hamburger, you've had beef. The word beef comes from the Old French word buef, which became the word for basically, cow meat. Beef is to cow as pork is to pig or mutton is to sheep. On the other hand, if you have a beef with someone, you have a complaint. Beefing is expressing such feelings.