A "lesnar" is an individual who seeks to elevate their social status by exaggerating their credentials or by acting to others as something they are not. This tends to be in homage of the famous wrestler Brock Lesnar.
"LESNAR!!!"

Why are these lesnars spitting bars in the canteen?
by Dougza March 2, 2011
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Usually said, on its own, as a sentence by itself, expressing extreme puzzlement at an excessively underwhelming situation or outcome. This was pretty much everyone's reaction to Brock Lesnar beating the Undertaker's Wrestlemania winning streak at Wrestlemania XXX.
"Lesnar? Lesnar. Seriously?!? Lesnar..."
by RioDragon April 7, 2014
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Having your face repeatedly pounded in by someone else's fist.
Frank Mir got Lesnared yet AGAIN in his fight with Shane Carwin.
by Mansnake April 17, 2010
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The WWE wrestler Bobby Lashley. Generally used on internet forums.
Black Lesnar is for real, Black Lesnar is the real deal,
by Mark Strachan June 7, 2006
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Cock Lesnar really showed douche-bagginess during his post-fight speech at UFC 100.
by Snarf Snarf Snarf July 12, 2009
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A badass pro wrestler. Known for his muscles. First off, Raivena's an idiot for mocking this guy. Raivena, the user, wouldn't even last 5 minutes in a ring with BL. Here's who Brock has defeated. Randy Orton, Ric Flair, Hulk Hogan, Dwayne The Rock, John Cena, Big Show, Chris Jericho, Kurt Angle, Triple H, CM Punk, Seth Rollins, Roman Reigns, Undertaker and Dean Ambrose. Match with the Undertaker was significant since he ended the Undertaker's streak. He's the 1 in Undertaker's 21-1 record. Does that sound like a bad wrestler to u. He is badass in wrestling pro. MMA career has been good as well with him defeating a pro MMA fighter. Unlike CM Punk, who lost to Mickey Gall in minutes. He's an awesome wrestler folks. Watch his matches on youtube for fun.
Person 1: Did u see Brock Lesnar beat Hulk Hogan in 2002.
Person 2: Yes, it was awesome to see.
Person 1: Brock is a future hall of fame professional wrestler.
by Fabulous Max March 19, 2017
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When you bust a fat nut on Paul heyman's head whilst completing a suplex
I busted a phat Brock lesnar last night
by Big boy brock April 9, 2019
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