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1.
An American mixed martial artist with the UFC as well as a inactive professional and former amateur wrestler. He is well known for his professional wrestling career in World Wrestling Entertainment (WWE).

Before gaining prominence in WWE, Lesnar was an accomplished amateur wrestler, and won the 2000 NCAA wrestling championship. In WWE, Lesnar was the 2002 King of the Ring, and won the 2003 Royal Rumble. He is also a three-time WWE Champion, and is the second youngest WWE Champion in history.

After leaving WWE in 2004, Lesnar pursued a career in the NFL. He played for the Minnesota Vikings, before being cut from the team for no-showing at practices due to injuries.

Lesnar returned to professional wrestling at the end of 2005, and joined New Japan Pro Wrestling, where he won the IWGP Heavyweight Championship in his first wrestling match since leaving the WWE. He was stripped of the title in July 2005, although he held the physical belt until June 2007.

Lesnar started a career in Mixed Martial Arts, and had his first match, in June 2007. He has since signed with Ultimate Fighting Championship and faught Frank Mir, losing via kneebar. He then faught Heath Herring and beat him via decision. Brock Lesnar is about 6'2'' and 265lbs. Pure muscle. He is a beast.
Brock Lesnar will rip ur f'in head off.
by Jeremyqwerty August 30, 2008
 
2.
The joke of the MMA world. Should not be appreciated and is hazardous to one's health due to high fat content
Brock Lesnar vs. Frank Mir 1
by Raivena November 20, 2009
 
3.
A MMA Heavyweight champion who fights at 280 pounds and is known for his incredible strength and speed. He is an ex-college wrestler and ex-professional wrestler who has taken the MMA world by storm with a series of wins against some of MMA's best.
Fedor is afraid to fight Brock Lesnar because he doesn't want to lose.
by Jim Thorpe August 04, 2009