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To emphasize the intensity of something. Also can be doubled-up to really intensify an object.
1. Man, that accident left a hellacious scar on your back.

2. That pig at the fair was hellaciously ginormous. (Doubled-up)

3. Dude, that's a hellacious amount of "oregano" you have there.
by *Hawaiian Baby* July 12, 2009
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Sep 6 Word of the Day
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Damn that was a steezy ass kickflip son!
by niggaliciouszor April 29, 2007
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Can be used in a negative or positive way.
Positive-Outstanding, Totally Slammin'
Negative-Overwhelming, unbearable!
-Damn, The work today was Hellacious

+Damn, That playas booty was hellacious
by Nessa March 20, 2004
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something so wickedly awesome that you cant think of any other word to say but Hellacious
oh man that is some hellaciously good herb, good thing i gots the mother fuckin hook up in the best damn chronix in the northern H.
by herbacious October 14, 2005
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An Adjective used to describe something horribly bad.
Did you see that dude with the mullet walk in? It was so hellacious, I can't believe he even left the house looking like that!
by Terri L. August 18, 2007
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1. a word that actually exists.

2. an extremely unpleasant thing

3. something that annoyed you because it took too long

4. a way to describe anything that didn't go your way
1. Kit: You use the word hellacious? Sweet.

2. That was a hellacious thing.

3. That wait for a sno-cone was hellacious

4. Today was a hellacious day at work.
by um... not Bridget... May 09, 2005
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