"What's beef? Beef is when a **** like you can't sleep/Wake up wit no appetite and you can't eat/Better look both ways fo' you walk in the street cuz you don't wanna bump heads wit a **** like me" - Lil Flip

Beef is a feud between two rappers. There are different levels of beef. In some, there is a deep hatred (50 Cent vs. Ja Rule). In others, it is more an off-and-on thing (Ludacris vs. T.I.). Some beefs end tragically (Tupac vs. Biggie). Others, you don't even know existed (Afroman vs. The World) Some rappers have made a career beefing and battling (KRS-ONE, The Game, 50, Kool Moe Dee). Sometimes beefs are mismatches (KRS vs. Nelly). Some are gladiator battles (Nas vs. Jay-Z). Most occur between former friends (Ice Cube vs NWA, Dr. Dre vs. Eazy E, Big vs. Pac, Nas vs. Jay, Daz vs. Kurupt, Lil Wayne vs. Gille Da Kid). Others are between a legend and an up-and-comer (Common vs. West Side Connection). Some have ended with the two becoming friends (Nas vs. Jay again). Others, while the shots have stopped firing, stiil exist (Eminem vs. Benzino). At any rate, there is no lack of great diss songs (Nas' Ether, Ludacris' War With God, Common's I Used to Love H.E.R., Ice Cube's No Vaseline, Afroman's Whack Rappers, Jay-Z's Supa Ugly, KRS-ONE's The Blastmaster, 50 Cent's Wankster, Fat Joe's Massacre) These are the ten biggest beefs of all time. (East Coast-West Coast doesn't count)

1. Tupac Shakur vs. The Notorious B.I.G.

2. Nas vs. Jay-Z

3. 50 Cent vs. Murder Inc.

4. Common vs. West Side Connection

5. Kool Moe Dee vs. Busy Bee (the original)

6. The Game vs. 50 Cent

7. Ice Cube vs. NWA

8. T.I. vs. Lil Flip

9. Eminem vs. Benzino

10. Mobb Deep vs. Tru Life