Guitar. The tuning of the low E string down to a D. This allows one to simply bar one finger across the 3 low strings (D, A, D) and create a simple and powerful chord, 1-5-1.

Drop D is generally used by talentless nu-metal bands who cannot actually play anything noteworthy.
System of a Down uses a lot of Drop D. Maybe that's why they suck so bad?

Alternate tuning isn't always bad. Real bands like Led Zeppelin use open G and open F for slide guitar and harmonics with advanced picking.
by Nuclear June 7, 2004
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Troglodytes with no skill can play guitar using drop D tuning. Just put your fat finger across the stings and, wow, a power chord. Slide it up and down and you've got a song! (see sk8rboi for an exapmle)

List of guitars by dificulty of playing:

1 Reular Guitar
2 Guitar Hero game
3 Elmo's play-along guitar
4 Guitar tuned to drop D
Wow, my retarded two year old kid just wrote a killer punk rock song in drop D tuning. Actually, he was just trying to jack off my guitar.
by buffalobob July 17, 2006
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1. Resuming activity after spacing off or wasting time.
2. The opposite of Holding D.
"We need to start dropping D and get some work done around here." "Drop your D and pick up your hooves, there's s to do!"
by Der Künstler January 16, 2006
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The majority of modern heavy metal. Music which is thrashy for the sake of thrashy and usualy played by complete idiots.

Usualy played in drop D (a guitar tunning acheived by by loosening the low E until it is a D) as the name would sugest, but can be played in any drop tunning.

Most riffs will consist of 2 to 4 bars of beefy low end crunch, followed by a quick Dime squeel. Lyrics will either be growled or sang in a wingy moany fashion similar to crying. Drummer will usualy play with a double bass pedal and a chineese ride symbol.

Common characteristics include: Not being able to tell riffs apart from each other, not being able to tell songs apart from each other, not being able to tell bands apart from each other.
Dickhead in boiler suit: "Are you going to download festival this year?".
Classic metaler: "No".
Dickhead in boiler suit: "Why not?"
Classic metaler: "coz it's all drop D dickhead music".
Dickhead in boiler suit:(begins to winge like a bitch)
by Zorn/eye-wanabee May 28, 2009
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An alternate tuning for the guitar, CGCFAD as opposed to EADGBE. More commonly (and mistakenly) referred to as Drop C.

Many bands utilize this particular tuning, including, but not limited to, As I Lay Dying, Killswitch Engage, System of a Down, Children of Bodom, Lostprophets, Breaking Benjamin, Bullet For My Valentine, Rammstein, Atreyu, Senses Fail, From First To Last, Metallica, Norma Jean, Thrice, A7X, and The Red Jumpsuit Apparatus.
Bill: "Dude, I love how Atreyu plays all of their songs in Drop C!"
Bob: "No man, they play in Dropped D Tuned Down One Whole Step."
Bill: "Dude, that's a long ass name. Lets just call it Drop C."
Bob: "OK."
by jeauxzuf November 14, 2007
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