origin: [1930's] American; hell + acious like audacious, bodacious, atrocious.
A force to be reckoned with; overwhelming; beyond amazing; the dirty version of supercalifragilisticexpialidocious -- can be used as a compliment or an insult. Now, how many other words can you say that about? yes, that's a challenge ;)
origin: [1920's] British; hell + acious like audacious, bodacious, atrocious.
If you favor one of your hands over the other...congratulations, you've mastered the art of handedness!
If you can lay one of your hands on top of the other, and the thumbs are on opposite sides, then you've mastered the other art of handedness = a mirror image that does not match when laid one on top of the other. For more on this concept see the recently defined: Chirality & Enantiomer.
And lastly, it can be the potential spin of a particle (via helicity) in subatomic physics. I have a feeling that one won't come in handy as much as the other two definitions though ~