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Mayhem Fest 

Started in 2008, a yearly music festival sponsored by Rockstar energy drink that takes place in the summer. Started by Vans Warped Tour founded by Kevin Lyman and by John Reese (partner of Lyman on Taste of Chaos Tour).

Dominated by metal bands (mostly death metal) but will also have plain metal, heavy metal, and nu-metal. Most bands are todays metal (i.e. no Metallica, Iron Maiden, etc.)

Some bands that have appeared at Mayhem are Slayer, Korn, Lamb of God, All That Remains, Disturbed, Slipknot, Cannibal Corpse, 3 Inches of Blood and tons more.
Guy1: Are you going to Mayhem Fest this year?

Guy2: Hell yeah! Mayhem fucking rules!! Man, Ozzfest is looking dead now.
Mayhem Fest by RoboChickin July 19, 2010
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Mayhem Fest 

A large group of rapists wearing Disturbed basketball jerseys
Guy 1: Yo dude, you going to Mayhem Fest this Saturday?
Guy 2: Lol no, what do you think I am, a rapist!?!

Rockstar Mayhem Festival 

A huge(and awesome tour,annual festival) 08 was its first year The headline bands were Disturbed,Slipknot,Mastadon,Dragonforce while there were many other awesome METAL bands at the Mobile Hot Topic and Jaggermister stages.
Person 1: Dude Rockstar Mayhem Festival was awesome, ill never be the same again
Person 2: Dude you should put this on urban dictionary
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trucker's tan 

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I had a trucker's tan after driving for 10 straight hours on a sunny day.
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Origin of the word is unknown. Started sometime in World War 2. Given the typical evolution of British slang, could easily have started because what these experts did was confusing or “baffling” to the common person.
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I saw Satantango last night, wonderful film but by the 5th hour I had to start doing pee calculus.
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or, in a positive usage:

"Booya! That freestyle was dutty!"
Dutty by J Hall April 3, 2003
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