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1. Horns up
A metalhead term that can be used in a way somewhat similar to "thumbs up" or as a sign of appreciation, generally followed by throwing the horns.
"Horns up to... (insert band/place/item)"
2. invisible grapefruit clutch
A heavy-metal hand gesture, in which the subject holds out their hand(s), palm up, fingers broadly curled inward, as if clutching an invisible grapefruit, or an orb of majestic evil power (still invisible).
When the throwing of horns got co-opted by the widespread public to the point where they were often seen from Jonas Brothers fans, Lord Blaspherion G. McSatan decided to adopt a more metal-centric hand gesture: the invisible grapefruit clutch.
3. throw the goat
As pointed out previously, to "throw the goat", you need to extend your index finger and your pinkey (as if you're pointing at something with those fingers), while also curling your middle and ring fingers down until they touch your palm. Your thumb is then placed over those two fingers.

You can then display this in one of two typical ways.

The first way is by holding your hand out in front of you, with the index and pinky fingers pointing upward and the other fingers and thumb pointing away from you.

The second is by holding your hand extended above your head, with the index and pinky fingers pointing upward and the other fingers and thumb pointing away from you, and then waving your hand forward and back, forward and back, over and over again in a rapid, fluid motion (this is actually the "throw" part of the phrase) - at a rock music concert, this motion is typically performed to the beat or rhythm of the music or lyrics.

"Throwing the goat" originated at early
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by Soda Bob Apr 16, 2004 add a video
4. \../,
Used to express throwing "the goat" (aka "devil horns" or "metal fingers") when typing. Often used sarcastically or to annoy someone. Can be used mockingly in place of responses like "That's badass," or "Sick, man!" Also frequently applicable when someone says something awkward, embarrassing, or nerdy.
Friend 1: ...Of course, that's only if you completely disregard wind resistance and assume the entire situation is taking place at sea level.

Friend 2: \../,
5. Texas Longhorns
The best college in most sports. They have been to the College World Series more times than any other team. Hated by most because they are so fucking bomb. Second most wins of the decade (behind Boise State) and second most wins of all-time (Behind Michigan). Has been robbed of multiple Heisman Trophies (Vince Young and Colt McCoy) and National Championships (08-09 and 09-10). They wreck the shit out of everyone.
"Texas Longhorns defeats USC, the so-called greatest College Football team ever, in the National Championship!"

"Texas gets off to an amazing start against Alabama! Oh no, an Alabama player just speared Colt McCoy in his throwing shoulder, they will now bring in 18 year old Garrett Gilbert to play Quarterback."
6. Horned Bird
A bastardization of giving someone the finger and throwing the Devil Horns gesture made popular by the Heavy Metal community. This is either done because someone is too tired to care, because they are a poser, or because they were torn between telling someone to rock on and fuck off.
My buddy had his picture taken with Isahn at Prog Power. He obviously didn't want it taken, can't you see the Horned Bird he's giving the camera?
7. \m/(- -)\m/
the little moshing dude throwing the devil horns. often used on instant messengers
dude 1: woo gig tonight!!
dude 2: yeah cant wait \m/(- -)\m/
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