Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • transitive v. To strike (someone or something) with a sharp blow; slap.
  • transitive v. Slang To kill deliberately; murder.
  • intransitive v. To deal a sharp, resounding blow.
  • n. A sharp, swift blow.
  • n. The sound made by a sharp, swift blow.
  • whack off Vulgar Slang To masturbate.
  • idiom have Informal To try out; attempt.
  • idiom out of whack Informal Improperly ordered or balanced; not functioning correctly.
  • idiom whacked out Slang Exhausted.
  • idiom whacked out Slang Crazy.
  • idiom whacked out Slang Under the influence of a mind-altering drug.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A blow, impact or slap.
  • n. A share or portion.
  • n. An attempt.
  • v. To hit, slap or strike.
  • v. To kill, bump off.
  • v. To share or parcel out.

from the GNU version of the Collaborative International Dictionary of English

  • transitive v. To strike; to beat; to give a heavy or resounding blow to; to thrash; to make with whacks.
  • transitive v. To divide into shares; ; -- often with up.
  • intransitive v. To strike anything with a smart blow.
  • n. A smart resounding blow.
  • n. A portion; share; allowance.
  • n. an attempt

from The Century Dictionary and Cyclopedia

  • n. Fettle; condition.
  • To give a heavy or resounding blow to; thwack.
  • To divide into shares; apportion; parcel out.
  • To strike, or continue striking, anything with smart blows.
  • To make a division or settlement; square accounts; pay: often in the phrase to whack up.
  • n. A heavy blow; a thwack.
  • n. A stroke; a trial or attempt: as, to take a whack at a job.
  • n. A piece; a share; a portion.
  • n. Appetite.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • v. hit hard
  • n. the sound made by a sharp swift blow
  • n. the act of hitting vigorously

Etymologies

Probably imitative.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Onomatopoeic. (Wiktionary)

Examples

  • The Ducks are whole other squad in their building, while on the road, Jeremiah Masoli is as cool as a Stuart Scott catchphrase that was as whack as the term whack was back in 2003.

    Scout.com > CollegeFootballNews.com

  • No. 17, 559 yards, par 5 (Lang Whang): A "good whack" is required for players to have a reasonable chance of reaching the green.

    Breaking down all 18 holes of British Open host Turnberry

  • It's about PETA, once again, showing that they are a bunch of fuckin 'whack-jobs.

    Friday Pix

  • With Rasheed Wallace (calf) and Allen Iverson (back) also out, the Pistons were missing a combined average of 48.5 points per game, and were out of whack from the start.

    USATODAY.com

  • A good whack from a silver string axe leaves your big turkey ghost just a cold casserole.

    Archive 2007-11-01

  • Paddy-whack is a pathetic critter - a true example of obsessive-compulsive behavior.

    Sound Politics: More on the bogus finding in the voter registration court case

  • First let me say this is the whackest anime I've seen, it beats the final two episodes of Neon Genesis because Lain has been whack from the beginning.

    January 2004

  • GOLDBERG: Well, I think that you need to be really clear that the people that you refer to as whack jobs and the people who -- the anarchists is who you are talking about.

    CNN Transcript Aug 28, 2004

  • And losing four fine, big heifer calves at one whack is no way to get rich; is it, Miss Louise?

    The Ranch at the Wolverine

  • One thing we've got is this thing I call the whack-a-mole, where it's a rhythm section that's built into the snow.

    ESPNsoccernet

Comments

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  • tAKE nOTES:
    http://www.youtube.com/watch?v=7tt-WIdmCVQ

    April 11, 2010

  • @Asativum: That's because you're thinking of wack.

    January 22, 2009

  • "'Barack Obama.' Sounds expensive. Never seen one in the Wal-Mart, anyhow. You know, come to think of it, I bet it's somethin' for the computer. Everything's for computers nowadays. Could be one of them new-fangled electronic gadgets, too, I s'pose. Something you watch the videos on. But I already got me a TV set, so unless this Barack Obama thing does something useful like whack weeds, I think I'll pass."
    - Lyle Dixon, 'What In The Heck's A Barack Obama?', theonion.com, 29 Oct 2008.

    October 30, 2008

  • Note that even WeirdNet doesn't try to say this has any relationship to goofy, weird or wacky.

    October 14, 2008

  • "A whacking fine whip, said Lenehan, is W. Lane."
    Joyce, Ulysses, 14

    January 21, 2007