verb

• to act foolish; under the influence of alcohol or drugs; or to do something dangerous.

  That boy was actin' last night.

  by Brian, Downingtown, PA, USA, Oct 15 2002.

adjective

• wild almost to the point of losing control, but effective.

  When you got up on the table and started lecturing us, that was pretty aggro!

  by Kevin Watson, Southern, Kawartha Lakes, ON, Canada, Nov 10 1997.

• aggravated; angry.

  Everything was cool then he just went aggro.

  by Weal Acodificare, USA, Mar 21 1999.

• "aggressive", from the US West Coast surfing / skateboarding culture.

  Alva and Peralta's aggro style changed skateboarding forever.

  by Michael M., Aug 21 2002.

noun

• aggravation. Also abbreviated ag, but pronounced in its full form in south-east England and other areas. To "look for aggro" is to look for a fight.

  He's been getting a bit of aggro from his boss.

  by Mark Ostrowski, Mongolia, Jun 05 1997.

• In computer MMORPGs (massively-multiplayer online role playing games,) "anger" that the in-game characters have towards your player. Usually received when you attack them.

  If you get aggro, the goblin is going to take 50 of your hit points.

  by Sam, Jun 25 2008.

adjective

• extreme.

  That was one balls-out street race!

  by Brad W., Portland, OR, USA, Feb 03 2003.

adverb

• with reckless abandon and extreme courage; HEAD-LONG; WITH A FULL HEAD OF STEAM; GIVING IT ONE'S ALL.

  Those motorcyclists took that steep hill balls out!

  You just have to go balls out to win this game.

  by Jon L., Naples, FL, USA, May 22 1999.

notes

• also balls to the wall.

  by Alan H., New York, NY, USA, Jul 31 1998.

• Possible etymology: The original phrase is actually hinted to in the expression "with a full head of steam". In the earliest days of steam engines, Watt style engines and their successors used a centrifugal governor to control speed. The faster the engine was to run the higher the weighted balls on the governor would rise until at full speed they were at their highest and farthest reach from the center: high or full speed was known as running "balls out".

  by tg, Georgia, USA, Feb 29 2008.

adjective

• unbelievable; ridiculous. See also go bananas

  That Chris tucker movie was bananas.

  by Demetrius Scruggs, FL, USA, Dec 22 1997.

adjective

• uncontrollable, uncivilized; CRAZY.

  I'm tired of going to parties where everybody is buck wild.

  by Demetrius Scruggs, FL, USA, Dec 22 1997.

verb

• to go crazy.

  I'm about to go bejesus in here!

  by Nate B., Cleveland, OH, USA, Aug 05 2002.

adjective

• extreme.

  He's a hardcore skate-boarder.

  by Laura C., NJ, USA, Dec 06 1999.

• very good; AWESOME.

  My new skateboard is hardcore!

  by Laura C., NJ, USA, Dec 06 1999.

• a lot of.

  She's making hardcore money at her new job.

  by Anonymous, Oct 01 2001.

adjective

• extreme.

  That was one mean roller coaster!

  by WalterGR, Jun 11 1998.

• very good, excellent; COOL.

  by WalterGR, Jun 11 1998.

adjective

• very good, excellent; COOL. Also many variations such as off the heezy, off the fa-sheezy, off the clock, etc.

  Yo man, that movie was off the hook!

  by K-Money, Wilmington, NC, USA, Oct 31 1997.

• extremely upset.

  Yo, since you told all her business, she's been acting off the hook.

  by Mr. Notaplayah, Washington, DC, USA, Feb 23 1998.

• wild or crazy.

  That party was off the hook!

  by thomas "., VA Beach Blvd, Virginia Beach, VA 23454, USA, Jun 04 1998.

• to be proven not guilty of something, or to be ruled out as a suspect, usually when one is in fact the perpetrator.

  She didn't recognize me so I'm off the hook.

  by Carrie S., San Diego, CA, USA, Feb 03 2000.

• to escape one's responsibility or duty.

  The boss found someone else to do it, so I'm off the hook.

  by Carrie S., San Diego, CA, USA, Feb 03 2000.

adjective

• ridiculous, absurd. Popularized by the United States radio/TV program Love Line.

  by Michael Cassell, Sacramento, CA, USA, Mar 24 1997.